Muséum National d'Histoire Naturelle (MNHN) (2022): Selection of R/V Marion Dufresne ferromanganese samples stored in the MNHN collections. Period 1973-1992 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.942718
Always quote citation above when using data! You can download the citation in several formats below.
Published: 2022-03-28 • DOI registered: 2022-07-16
Abstract:
Ferromanganese deposit samples (nodule and crust) taken from cores and dredges retrieved during the past R/V Marion Dufresne cruise from 1973 until 1992 are stored in the collections of the Muséum d'Histoire Naturelle (MNHN) (https://www.mnhn.fr/fr/sediments-et-roches-oceaniques). They can be queried interactively using a dedicated Internet platform (https://science.mnhn.fr/institution/mnhn/collection/gs/item/search) and are avilable on site for sampling and study.
Related to:
Moreno, Eva; Bartolini, Annachiara (2021): Ocean Cores, Climate Archives. In: Natural History Collections in the Science of the 21st Century, Wiley, 159-175, https://doi.org/10.1002/9781119882237.ch11
Source:
Muséum National d'Histoire Naturelle (MNHN): Selection of R/V Marion Dufresne ferromanganese samples stored in the MNHN collections. Period 1973-1992 [webpage]. https://www.mnhn.fr/fr/collection-des-sediments-et-roches-oceaniques
Project(s):
Coverage:
Median Latitude: -26.428410 * Median Longitude: 61.339077 * South-bound Latitude: -58.283330 * West-bound Longitude: 27.013333 * North-bound Latitude: 21.360000 * East-bound Longitude: 86.916670
Date/Time Start: 1975-06-19T00:00:00 * Date/Time End: 1992-09-15T00:00:00
Minimum DEPTH, sediment/rock: 0.0 m * Maximum DEPTH, sediment/rock: 0.5 m
Event(s):
MD-DR750007 (MD 06-28-DR) * Latitude: -34.575000 * Longitude: 63.516667 * Date/Time: 1975-06-19T00:00:00 * Elevation: -4147.0 m * Recovery: 39 kg * Location: Indian Ocean * Campaign: MD06 (NOSICAA) * Basis: Marion Dufresne (1972) * Method/Device: Dredge (DRG) * Comment: Institute: MNHN
MD-DR750008 (MD 06-30-DR) * Latitude: -39.560000 * Longitude: 60.888333 * Date/Time: 1975-06-22T00:00:00 * Elevation: -4410.0 m * Recovery: 50 kg * Location: Indian Ocean * Campaign: MD06 (NOSICAA) * Basis: Marion Dufresne (1972) * Method/Device: Dredge (DRG) * Comment: Institute: MNHN
MD-DR750009 (MD 06-32-DR) * Latitude: -41.388333 * Longitude: 59.770000 * Date/Time: 1975-06-23T00:00:00 * Elevation: -3900.0 m * Recovery: 163 kg * Location: Indian Ocean * Campaign: MD06 (NOSICAA) * Basis: Marion Dufresne (1972) * Method/Device: Dredge (DRG) * Comment: Institute: MNHN
Comment:
From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | MNHN | |||
| 2 | Identification | ID | MNHN | Sample set identification in MNHN collection | ||
| 3 | Sample ID | Sample ID | MNHN | |||
| 4 | DEPTH, sediment/rock | Depth sed | m | MNHN | Geocode | |
| 5 | Position | Position | MNHN | |||
| 6 | Deposit type | Deposit type | MNHN | |||
| 7 | Quantity of deposit | Quantity | MNHN | |||
| 8 | Size | Size | MNHN | |||
| 9 | Substrate type | Substrate | MNHN | |||
| 10 | Description | Description | MNHN | |||
| 11 | Image | IMAGE | MNHN |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1072 data points
Data
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| 1 Event | 2 ID | 3 Sample ID | 4 Depth sed [m] | 5 Position | 6 Deposit type | 7 Quantity | 8 Size | 9 Substrate | 10 Description | 11 IMAGE |
|---|---|---|---|---|---|---|---|---|---|---|
| MD28-32C | MNHN_GS_BL81-0001 | MD-BL810001-1-A | 0.0 | Surface | Mn nodule | 3 | 3.0-5.0 cm | Core; consolidated sediment | 3 black Mn nodules of spheroidal (3.0 cm) to polylobate shape (5.0 cm) resulting from accretion of smaller nodules. The core is made of clayey material and the rind is 0.1 cm thick | MNHN_GS_BL81-0001_1_Small.jpg |
| MD28-32C | MNHN_GS_BL81-0001 | MD-BL810001-1-B | 0.0 | Surface | Mn nodule | 1 | 5.0 cm | Core; shark tooth,consolidated sediment | One black botryoidal polylobate Mn nodule with a large blackened shark's tooth in its core. The rest of the core is made of clayey material with 0.2 cm thick rind | MNHN_GS_BL81-0001_2_Small.jpg |
| MD28-32C | MNHN_GS_BL81-0001 | MD-BL810001-1-C | 0.0 | Surface | Mn nodule | 2 | Core; consolidated sediment | Two black botryoidal ploylobate Mn nodules (5.0 cm). One presents its bottom face stained by sediment | MNHN_GS_BL81-0001_6_Small.jpg | |
| MD20-08B | MNHN_GS_CP79-0002 | MD-CP790002-2-A | 0.0 | Surface | Mn crust | 1 | 1.5 cm thick | Consolidated sediment | A botryoidal surface black manganese crust (1.5 cm thick) on hardened beige nannofossil ooze. The sample is presented bottom face up | MNHN_GS_CP79-0002_1_small.jpg |
| MD20-08B | MNHN_GS_CP79-0002 | MD-CP790002-1-A | 0.0 | Surface | Mn nodule | 2 | 3.5-5.0 cm | 2 dark-brown spherical Mn nodules with a slightly botryoidal surface (3.0-5.0 cm). One presents its bottom face stained by sediment | MNHN_GS_CP79-0002_2_small.jpg | |
| MD20-08B | MNHN_GS_CP79-0002 | MD-CP790002-1-B | 0.0 | Surface | Mn nodule | 2 | 3.0 cm | Core; palagonite | 2 dark-brown botryoidal polylobate Mn nodules with a smooth surface (3.0 cm) with an orange-red core (palagonite ?) and a 0.1 cm rind | MNHN_GS_CP79-0002_3_small.jpg |
| MD20-08B | MNHN_GS_CP79-0002 | MD-CP790002-1-C | 0.0 | Surface | Mn nodule | 1 | 3.0 cm | Core; shark tooth,consolidated sediment | One dark-brown botryoidal polylobate Mn nodule with a smooth surface (3.0 cm) and an inserted shark's tooth as main core. Clayey external part of the core with a 0.1 cm rind | MNHN_GS_CP79-0002_5_small.jpg |
| MD20-08B | MNHN_GS_CP79-0002 | MD-CP790002-3-A | 0.0 | Surface | Mn coating | 1 | Thick | Bone | An elongated probable cetacean bone with a thick dark brown smooth botryoidal surfaced Mn coating | MNHN_GS_CP79-0002_6_small.jpg |
| MD20-08D | MNHN_GS_CP79-0003 | MD-CP790003-2-A | 0.0 | Surface | Mn nodule | 2 | 5.0-7.0 cm | Core; consolidated sediment | Two irregular shaped dark brown to black Mn nodules (5.0-7.0 cm) with a rather botryoidal surface and clayey core with a 0.2 cm thick external rind | MNHN_GS_CP79-0003_2_small.JPG |
| MD20-08D | MNHN_GS_CP79-0003 | MD-CP790003-1-A | 0.0 | Surface | Mn crust | 1 | 1.5 cm thick | Consolidated sediment | A flat concretion of hardened beige nannofossil ooze with a thick crusty botryoidal Mn crust (1.5 cm thick) | MNHN_GS_CP79-0003_3_small.JPG |
| MD20-13B | MNHN_GS_CP79-0005 | MD-CP790005-2-A | 0.0 | Surface | Mn crust | 1 | 0.5 cm thick | Consolidated sediment | A concretion of hardened beige nannofossil ooze with a thin blackened Mn crust (0.5 cm thick)with botryoidal surface | MNHN_GS_CP79-0005_1_small.JPG |
| MD20-13B | MNHN_GS_CP79-0005 | MD-CP790005-1-A | 0.0 | Surface | Mn nodule | 2 | 3.5 cm | Core; consolidated sedimen | Two perfectly spherical black Mn nodules (3.5 cm) with a slightly botryoidal rather rough surface. On is sectioobed showing a clayey core with a radiated structure and a 0.1 cm thick external rind | MNHN_GS_CP79-0005_2_small.JPG |
| MD20-13B | MNHN_GS_CP79-0005 | MD-CP790005-1-B | 0.0 | Surface | Mn nodule | 2 | 2.0-4.0 cm | Core; palagonite | Two polylobate brown black Mn nodules (2.0-4.0 cm) with a smooth surface. One shows a possible reddish palagonite core | MNHN_GS_CP79-0005_3_small.JPG |
| MD20-13B | MNHN_GS_CP79-0005 | MD-CP790005-1-C | 0.0 | Surface | Mn nodule | 2 | Fragment | Core; consolidated sedimen | Two fragments of semi-ellipsoidal black Mn nodules with a botryoidal rather smooth surface. Fragments show a clayey core with a 0.3 cm thick external rind | MNHN_GS_CP79-0005_4_small.JPG |
| MD20-19C | MNHN_GS_CP79-0009 | MD-CP790009-2-A | 0.0 | Surface | Mn nodule | 1 | 7.0 cm | A remarkably spherical brown black Mn nodule (7.0 cm) with rather rough surface formed of small botryoids | MNHN_GS_CP79-0009_1_small.JPG | |
| MD20-19C | MNHN_GS_CP79-0009 | MD-CP790009-1-A | 0.0 | Surface | Mn crust | 1 | 1.5 cm thick | Rock; chalk and Consolidated sediment | A rather flat fragment of chalky material with an indurated black Mn crust (1.5 cm thick) with a botryoidal surface | MNHN_GS_CP79-0009_2_small.JPG |
| MD20-19E | MNHN_GS_CP79-0010 | MD-CP790010-1-A | 0.0 | Surface | Mn nodule | 2 | 5.0-6.0 cm | Core; bone | 2 spherical (5.0-6.0 cm) Mn nodules presenting a differential growth with an outside black rind (0.1 cm thick) covering an rather light brown inside showing a concentric laminated structure. The sectonned one presents a bone fragment as inner core | MNHN_GS_CP79-0010_3_small.JPG |
| MD20-19E | MNHN_GS_CP79-0010 | MD-CP790010-1-C | 0.0 | Surface | Mn nodule | 2 | 3.0-10.0 cm | Core; consolidate sediment | One small black polylobate botryoidal black Mn nodule (3.0 cm) and one section of an elongated black Mn nodule (10.0 cm) showing a clayey core | MNHN_GS_CP79-0010_4_small.JPG |
| MD20-19E | MNHN_GS_CP79-0010 | MD-CP790010-1-B | 0.0 | Surface | Mn nodule | 1 | 5.0 cm | Core; bone | One sectionned spherical (5.0 cm) Mn nodule presenting a differential growth with an outside black rind (0.2 cm thick) covering a rather brown inside showing a concentric radiated structure. A bone fragment forms the inner core | MNHN_GS_CP79-0010_6_small.JPG |
| MD20-26B | MNHN_GS_CP79-0012 | MD-CP790012-1-A | 0.0 | Surface | Mn nodule | 2 | 5.0 cm | Core; pumice | 2 black polylobate spherical Mn nodules (5.0 cm) with a smooth surface. One is sectionned showing a differential growth with an outside black rind (0.3 cm thick) covering a rather brown inside showing a concentric radiated structure. A pumice fragment could form the ultimate inner core | MNHN_GS_CP79-0012_1_small.JPG |
| MD20-26B | MNHN_GS_CP79-0012 | MD-CP790012-1-B | 0.0 | Surface | Mn nodule | 1 | 4.0 cm | Core; pumice | One black polylobate spherical Mn nodule (4.0 cm) with a smooth surface. The inner structure shows an outside black rind (0.5 cm thick) covering what could be a spherical pumice pebble | MNHN_GS_CP79-0012_2_small.JPG |
| MD20-26C | MNHN_GS_CP79-0013 | MD-CP790013-1-A | 0.0 | Surface | Mn nodule | 3 | 1.5-4.0 cm | Core; consolidate sediment,pumice | 3 black spheroidal to polylobate spheroidal Mn nodules (1.5-4.0 cm) with smooth surface. Two of them show a spherical core which could be either hardened clay or pumice | MNHN_GS_CP79-0013_1_small.JPG |
| MD20-27A | MNHN_GS_CP79-0014 | MD-CP790014-1-A | 0.0 | Surface | Mn nodule | 2 | 2.0-6.0 cm | Core; pumice | 2 quasi-ellipsoidal brown Mn nodules with a loosely botryoidal smooth surface. One is sectionned showing a differential growth with an outside black rind (0.1 cm thick) covering a rather brown inside.. A pumice fragment could form the ultimate inner core | MNHN_GS_CP79-0014_1_small.JPG |
| MD20-27A | MNHN_GS_CP79-0014 | MD-CP790014-1-B | 0.0 | Surface | Mn nodule | 2 | 2.0-10.0 cm | Core; pumice | One small (2.0 m) and one larger (10.0 cm) dark brown Mn nodules with a loosely botryoidal smooth surface. One is broken showing an outside black rind (0.2 cm thick) covering a reddish crust (palagonite ?) surrounding what could be an altered pumice fragment | MNHN_GS_CP79-0014_2_small.JPG |
| MD20-29 | MNHN_GS_CP79-0015 | MD-CP790015-1-C | 0.0 | Surface | Mn nodule | 1 | 4.0 cm | Core; shark tooth | One polylobate spherical black Mn nodule (4.0 cm) with smooth surface and a shark's tooth core | MNHN_GS_CP79-0015_3_small.JPG |
| MD20-29 | MNHN_GS_CP79-0015 | MD-CP790015-1-B | 0.0 | Surface | Mn nodule | 3 | 3.0 cm | Core; pumice | 3 spherical to polylobate spherical black Mn nodules (3.0 cm) with smooth surface. Some are broken and show a differential growth with an outside black rind (0.2 cm thick) covering a concentric laminates part (1.0 cm thick) itself surrounding a core formed of a probable pumice pebble | MNHN_GS_CP79-0015_4_small.JPG |
| MD20-29 | MNHN_GS_CP79-0015 | MD-CP790015-1-A | 0.0 | Surface | Mn nodule | 2 | 4.0 cm | 2 polylobate spherical black Mn nodules (4.0 cm) with smooth surface resulting from the accretion of smaller spherical ones including the encrusting of probable biogenic debris | MNHN_GS_CP79-0015_5_small.JPG | |
| MD28-24 | MNHN_GS_CP81-0027 | MD-CP810027-1-A | 0.0 | Surface | Mn crust | 1 | 0.5-1.0 cm thick | Consolidated sediment | Friable plate of hardened bio-siliceous ooze with a black Mn crust (0.5-1.0 cm) with rough botryoidal surface | MNHN_GS_CP81-0027_2_small.JPG |
| MD28-24 | MNHN_GS_CP81-0027 | MD-CP810027-1-B | 0.0 | Surface | Mn crust | 3 | 0.1-1.0 cm thick | Rock; limestone,claystone | Flat fragments of bioclastic limestone to claystone with a black Mn crust (1.0 cm thick) sometimes turning into a thin reddish-brown Mn coating | MNHN_GS_CP81-0027_4_small.JPG |
| MD28-30B | MNHN_GS_CP81-0032 | MD-CP810032-1-A | 0.0 | Surface | Mn nodule | 2 | 2.0-3.0 cm | Core; pumice | 4 Mn nodules with coalescent polylobate to rather flat shape and smooth black surface. Some are broken and show a 0.3 cm black rind around a pumice core | MNHN_GS_CP81-0032_1_small.JPG |
| MD28-31B | MNHN_GS_CP81-0033 | MD-CP810033-1-A | 0.0 | Surface | Mn nodule | 1 | 2.0 cm | Core; pumice | One black ellipsoidal Mn nodule (2.0 cm) with a grained surface. The core is most likely pumice | MNHN_GS_CP81-0033_1_small.jpg |
| MD28-31A | MNHN_GS_CP81-0034 | MD-CP810034 -1-A | 0.0 | Surface | Mn nodule | 2 | 1.0-5.0 cm | Core; pumice | 2 black Mn nodules. One spherical (1.0 cm) with grained surface. One rather flat ellipsoidal (5.0 cm) with botryoidal surface. The latter with a probable pumice core | MNHN_GS_CP81-0034_1_small.JPG |
| MD28-31A | MNHN_GS_CP81-0034 | MD-CP810034 -1-B | 0.0 | Surface | Mn nodule | 1 | 2.5 cm | Core; pumice | One sectionned black ellipsoidal Mn nodule (2.5 cm) with 1.0 cm indurated rind surrounding a pumice core | MNHN_GS_CP81-0034_2_small.JPG |
| MD28-33A | MNHN_GS_CP81-0035 | MD-CP810035-1-A | 0.0 | Surface | Mn nodule | 1 | 2.5 cm | Core; pumice | One ellipsoidal black Mn nodule (2.5 cm) with gritty micro-botryoidal surface. With a pumice core and a 0.1 cm thick external rind. | MNHN_GS_CP81-0035_1_small.jpg |
| MD28-33A | MNHN_GS_CP81-0035 | MD-CP810035-2-A | 0.0 | Surface | Mn crust | 1 | Stone; pumice | One Mn encrusted pumice pebble. The Mn crust in brown-black with smooth surafce | MNHN_GS_CP81-0035_1_small.jpg | |
| MD28-33A | MNHN_GS_CP81-0035 | MD-CP810035-3-A | 0.0 | Surface | Mn coating | 3 | 0.5 cm thick | Tooth; shark | 3 blackened shark's teeth with black coating on their root (0.5 cm thick) | MNHN_GS_CP81-0035_5_small.jpg |
| MD28-33A | MNHN_GS_CP81-0035 | MD-CP810035-2-B | 0.0 | Surface | Mn crust | 2 | 0.5 cm thick | Pebble; pumice,palagonite | 2 partly Mn encrusted pumice fragments. The Mn crust (0.5 cm thick) is black and some pumice fragments are altered into reddish palagonite ? | MNHN_GS_CP81-0035_6_small.jpg |
| MD28-33C | MNHN_GS_CP81-0036 | MD-CP810036-1-A | 0.0 | Surface | Mn nodule | 3 | Core; pumice | 3 black Mn nodules with an angular shape. With a pumice core and a 0.1 cm thick external rind. | MNHN_GS_CP81-0036_1-small.JPG | |
| MD28-35A | MNHN_GS_CP81-0037 | MD-CP810037-1-A | 0.0 | Surface | Mn nodule | 2 | 2.0-3.0 cm | Core; pumice | 2 black Mn nodules (2.0-3.0 cm) with flattened shape and protruding botyroids emerging from a rather smooth surface. Weathered pumice core and a 0.1 cm thick external rind. | MNHN_GS_CP81-0037_1-small.JPG |
| MD28-35C | MNHN_GS_CP81-0038 | MD-CP810038-1-A | 0.0 | Surface | Mn nodule | 2 | 2.0-2.5 cm | Core; pumice | 2 black Mn nodules (2.0-2.5 cm). One is ellipsoidal and the second one is almost cubical. Both show a gritty botryoidal surface. One is sectionned and displays a two phased growth with external and internal 0.1 cm thick rinds. The core is pumice | MNHN_GS_CP81-0038_1_small.JPG |
| MD28-35C | MNHN_GS_CP81-0038 | MD-CP810038-1-A | 0.0 | Surface | Mn nodule | 2 | 2.0-3.0 cm | Core; pumice | 2 black spheroidal Mn nodules (2.0-3.0 cm) with gritty botryoidal surface. Both show a pumice core surrounded by a rather radiated growth zone ending with a 0.1 cm thick external rind | MNHN_GS_CP81-0038_3_small.JPG |
| MD28-36A | MNHN_GS_CP81-0039 | MD-CP810039-1-A | 0.0 | Surface | Mn nodule | 3 | 1.5-4.0 cm | Core; pumice | 3 Mn nodules (1.5-4.0 cm) with spherical to polylobate botryoidal shape ans mooth surface. Pumice core with a 0.5-1.0 cm external rind | MNHN_GS_CP81-0039_1_small.jpg |
| MD28-36A | MNHN_GS_CP81-0039 | MD-CP810039-2-A | 0.0 | Surface | Mn nodule | 2 | 5.0-10.0 cm | Core; pumice | 2 rather large black flattened Mn nodules concretions (5.0-10.0 cm) with a smaooth botryoidal surface. One is fragmented and shows a pumice substrate under a 0.5 cm thick external rind | MNHN_GS_CP81-0039_2_small.jpg |
| MD28-36A | MNHN_GS_CP81-0039 | MD-CP810039-3-A | 0.0 | Surface | Mn crust | 2 | 0.1-0.5 cm thick | Breccia; limestone | 2 brecciated limestone fragments with thin Mn crust (0.1-0.5 cm thick) | MNHN_GS_CP81-0039_3_small.jpg |
| MD28-36D | MNHN_GS_CP81-0040 | MD-CP810040-1-A | 0.0 | Surface | Mn nodule | 4 | 2.0-4.0 cm | Core; pumice | 4 quasi ellipsoidal black Mn nodules (2.0-4.0 cm) with a smooth surface sometimes peppered by protruding small botryoids. With a pumice core and a 0.1 cm thick external rind. | MNHN_GS_CP81-0040_2_small.JPG |
| MD28-34D | MNHN_GS_BL81-0002 | MD-BL810002-1-A | 0.0 | Surface | Mn nodule | 4 | 1.0-8.0 cm | Core; pumice | 4 Mn nodules (1 to 8 cm size) of spherical to flattened shape with weathered pumice core and a 0.3 cm thick rind | MNHN_GS_DBL81-0002_1_Small.jpg |
| MD28-34D | MNHN_GS_BL81-0002 | MD-BL810002-3-A | 0.0 | Surface | Fe-Mn coating | 1 | 0.5-1.0 cm thick | Tooth; shark | Mn dispersed staining on a shark's tooth upper part with a heavily Fe-Mn coated root | MNHN_GS_DBL81-0002_5_Small.jpg |
| MD28-34D | MNHN_GS_BL81-0002 | MD-BL810002-2-A | 0.0 | Surface | Mn crust | 1 | 0.5 cm thick | Small size light brown Fe-Mn crust fragment detached from substrate with a black crusty section | MNHN_GS_DBL81-0002_6_Small.jpg | |
| MD-DR750008 | MNHN_GS_DR75-0008 | MD-DR750008-2-A | 0.0 | Surface | Mn crust | 1 | 7.0 cm thick | Rock; tuff | One massive Mn crust fragment (7.0 cm thick) with a rather flat and smooth surface. The multilayered structure of the crust results from different growth phases. The substrate is argillaceous material (tuff) resulting from the weathering of basalt. | MNHN_GS_DR75_0008_1_small.JPG |
| MD-DR750008 | MNHN_GS_DR75-0008 | MD-DR750008-3-A | 0.0 | Surface | Mn coating | 2 | 0.5 cm thick | Pebble; basalt | 2 weathered basalt pebbles with Fe-Mn coating | MNHN_GS_DR75_0008_2_small.JPG |
| MD-DR750008 | MNHN_GS_DR75-0008 | MD-DR750008-1-A | 0.0 | Surface | Mn nodule | 2 | 3.0-5.0 cm | Core; basalt | 2 black polylobate spherical Mn nodules (3.0-5.0 cm) with a smooth surface. One shows a basalt core with a 0.5 cm thick external rind | MNHN_GS_DR75_0008_3_small.JPG |
| MD-DR750007 | MNHN_GS_DR75-0007 | MD-DR750007-1-A | 0.0 | Surface | Mn nodule | 2 | 3.0-4.0 cm | Core; smectite | 2 black Mn nodules (3.0-4.0 cm) with polylobate botryoidal shape and a griity surface. One shows a whitish clayey core with a 0.5 cm thick external rind. The broken surface of the other reveals a possible two phase growth of the external rind. | MNHN_GS_DR75-0007_1_small.JPG |
| MD-DR750007 | MNHN_GS_DR75-0007 | MD-DR750007-2-A | 0.0 | Surface | Mn crust | 1 | 3.0-4.0 cm thick | Rock; basalt | One fragment of a massive black Mn crust with smooth botryoidal surface (3.0 cm thick). The crust shows several growth phases and it covers a fragment of basalt | MNHN_GS_DR75-0007_1_small.JPG |
| MD-DR750009 | MNHN_GS_DR75-0009 | MD-DR750009-2-A | 0.0 | Surface | Mn crust | 1 | 5.0 cm thick | Rock; basalt | One massive Mn crust fragment (5.0 cm thick) with a rather flat and smooth surface. The multilayered structure of the crust results from different growth phases. The substrate is weathering of basalt. | MNHN_GS_DR75-0009_1_small.JPG |
| MD-DR750009 | MNHN_GS_DR75-0009 | MD-DR750009-1-A | 0.0 | Surface | Mn nodule | 1 | 9.0 cm | Core; volcanic ash,palagonite | One large black spheroidal Mn nodule (9.0 cm) with a smooth surface. The core is altered basalt (palagonite) with à 2.5 cm thick external rind | MNHN_GS_DR75-0009_2_small.JPG |
| MD-DR750010 | MNHN_GS_DR75-0010 | MD-DR750010-1-A | 0.0 | Surface | Mn nodule | 2 | 4.0-5.0 cm | Core; palagonite | 2 ellipsoidal polylobate black Mn nodules (4.0-5.0 cm) with a smooth botryoidal. One shows an altered reddish core (palagonite) with a 0.1 cm thick external rind | MNHN_GS_DR75-0010_1_small.JPG |
| MD-DR750010 | MNHN_GS_DR75-0010 | MD-DR750010-1-B | 0.0 | Surface | Mn nodule | 1 | 5.0 cm | Core; bone | One black polylobate botryoidal Mn nodule (5.0 cm). The shape suggests a cetacean bone core | MNHN_GS_DR75-0010_2_small.JPG |
| MD-DR750011 | MNHN_GS_DR75-0011 | MD-DR750011-1-A | 0.0 | Surface | Mn nodule | 1 | 3.0 cm | Core; rock fragment | 1 flat shaped brown-black Mn nodules (3.0 cm) with rough botryoidal. One has a probable rocky fragment core | MNHN_GS_DR75-0011_1_small.JPG |
| MD-DR750011 | MNHN_GS_DR75-0011 | MD-DR750011-2-A | 0.0 | Surface | Mn crust | 1 | 1.5 cm thick | One brown-black flat Mn crust fragment (1.5 cm thick) without substrate | MNHN_GS_DR75-0011_1_small.JPG | |
| MD-DR750012 | MNHN_GS_DR75-0012 | MD-DR750012-1-B | 0.0 | Surface | Mn crust | 1 | 3.0 cm thick | Consolidated sediment | One massive Mn crust (3.0 cm thick) with dark brown rather gritty surface. The multilayered structure of the crust results from different groth phases. The substrate is a clayey sometimes agglomerated in balls | MNHN_GS_DR75-0012_2_small.JPG |
| MD-DR750012 | MNHN_GS_DR75-0012 | MD-DR750012-1-A | 0.0 | Surface | Mn crust | 1 | 5.0 cm thick | Consolidated sediment | One massive Mn crust (5.0 cm thick) with black rather smooth surface. The multilayered structure of the crust results from different groth phases. The substrate is a whitish material made of well-crystallized phillipsite with fibrous clay minerals sometimes agglomerated in balls. Some balls are themselves Mn coated (buried Mn nodule ?) | MNHN_GS_DR75-0012_3_small.JPG |
| MD09-23B | MNHN_GS_DR76-0013 | MD-DR760013-1-B | 0.0 | Surface | Mn crust | 1 | 3.0 thick | Consolidated sediment | One massive Mn crust (3.0 cm thick) fragment with dark brown surface. The multilayered structure of the crust results from different groth phases. The substrate is a layered clayey material | MNHN_GS_DR76-0013_2_small.JPG |
| MD09-23B | MNHN_GS_DR76-0013 | MD-DR760013-1-A | 0.0 | Surface | Mn crust | 1 | 5.0 thick | Consolidated sediment | One massive Mn crust (5.0 cm thick) fragment with dark brown surface. The multilayered structure of the crust results from different groth phases. The substrate is a layered clayey material. The sample is presented with lower face up | MNHN_GS_DR76-0013_3_small.JPG |
| MD09-34C | MNHN_GS_DR76-0014 | MD-DR760014-1-A | 0.0 | Surface | Mn nodule | 2 | 4.0 cm | Core; consolidated sediment | 2 black cauliflower shaped Mn nodules (4.0 cm). The surface presents several small botryoids with a smooth surface. The core is a clayey brecciated material with a 0.5 cm thick external rind | MNHN_GS_DR76-0014_1_small.JPG |
| MD09-34C | MNHN_GS_DR76-0014 | MD-DR760014-1-B | 0.0 | Surface | Mn nodule | 1 | 15.0 cm | Core; consolidated sediment | One large black cauliflower shaped Mn nodules (15.0 cm). The surface presents several small botryoids with a smooth surface. The core is a clayey material | MNHN_GS_DR76-0014_2_small.JPG |
| MD09-40B | MNHN_GS_DR76-0015 | MD-DR760015-1-B | 0.0 | Surface | Mn nodule | 1 | 6.0 cm | Core; pumice | One large spherical dark-brown Mn nodule (6.0 cm) with a smooth surface. The core is pumice with a 0.3 cm thick external rind | MNHN_GS_DR76-0015_1_small.JPG |
| MD09-40B | MNHN_GS_DR76-0015 | MD-DR760015-1-A | 0.0 | Surface | Mn nodule | 3 | 2.0-4.0 cm | Core; shark tooth | 3 spherical or ellipsoidal dark-brown Mn nodules (2.0-4.0 cm) with a smooth surface. One presents a radiated inside structure without determined core and a distinct 0.3 Cm distinguishable outer rind. One has a shark's tooth as core | MNHN_GS_DR76-0015_2_small.JPG |
| SU02-2A | MNHN_GS_DR77-0001 | SU-DR770001-1-A | 0.0 | Surface | Mn crust | 1 | 8.0 cm thick | Consolidated sediment | One massive Mn crust (8.0 cm thick) fragment with dark brown surface. The multilayered structure of the crust results from different growth phases. The substrate is a layered clayey material | MNHN_GS_DR77-0001_1_small.JPG |
| MD14-2C | MNHN_GS_DR77-0016 | MD-DR770016-1-A | 0.0 | Surface | Mn nodule | 3 | 2.0-8.0 cm | 3 ellipsoidal brown Mn nodules (2.0-8.0 cm) with smooth surface | MNHN_GS_DR77-0016_1_small.JPG | |
| MD14-2C | MNHN_GS_DR77-0016 | MD-DR770016-1-B | 0.0 | Surface | Mn nodule | 2 | 4.0 cm | Core; pumice | 2 spheroidal to ellipsoidal brown Mn nodules (4.0 cm) with a rather smooth surface. The core is pumice sometimes weathered to red palagonite surrounded by a structureless growth zone and a 1.0 cm external rind with a radiated structure | MNHN_GS_DR77-0016_4_small.JPG |
| MD14-2C | MNHN_GS_DR77-0016 | MD-DR770016-1-C | 0.0 | Surface | Mn nodule | 2 | 2.0 cm | Core; shark tooth | One ellipsoidal brown Mn nodule (2.0 cm) with a rather smooth surface. One polylobate brown Mn nodule (2.0 cm) with a rather smooth surface. It results of the accretion of 3 smaller spherical Mn nodules around a shark's tooth core | MNHN_GS_DR77-0016_5_small.JPG |
| MD14-2C | MNHN_GS_DR77-0016 | MD-DR770016-2-A | 0.0 | Surface | Mn crust | 1 | 0.5 cm thick | Cobble; pumice | One large pumice cobble with a dark brown unevenly distributed Mn crust with a gritty surface (0.5 cm thick) | MNHN_GS_DR77-0016_6_small.JPG |
| MD14-35A | MNHN_GS_DR77-0019 | MD-DR770019-1-C | 0.0 | Surface | Mn nodule | 1 | 8.0 cm | One rather large brown-black polylobate botryoidal Mn nodules (8.0 cm) with a micro-botryoidal surface | MNHN_GS_DR77-0019_1_small.JPG | |
| MD14-35A | MNHN_GS_DR77-0019 | MD-DR770019-2-A | 0.0 | Surface | Mn crust | 1 | 2.0 cm thick | One dark-brown flat crust-like Mn concretion (2.0 cm thick) with rough gritty surface. No visible substrate | MNHN_GS_DR77-0019_2_small.JPG | |
| MD14-35A | MNHN_GS_DR77-0019 | MD-DR770019-1-A | 0.0 | Surface | Mn nodule | 2 | 2.0-3.5 cm | Core; pumice | 2 brown-black spheroidal Mn nodules (2.0-3.5 cm) with a micro-botryoidal surface. One shows an external rind (0.2 cm thick) around a pumice core | MNHN_GS_DR77-0019_3_small.JPG |
| MD14-35A | MNHN_GS_DR77-0019 | MD-DR770019-1-B | 0.0 | Surface | Mn nodule | 2 | 2.5 cm | Core; pumice | 2 brown-black spherical Mn nodules (2.5 cm) with a micro-botryoidal surface. One is sectionned and shows a thick structureless rind (2.7 cm thick) around a small pumice fragment. The second contrast by an apparent thin external rind (0.1 cm thick) around a large pumice core | MNHN_GS_DR77-0019_4_small.JPG |
| MD20-23C | MNHN_GS_DR79-0020 | MD-DR790020-1-A | 0.0 | Surface | Mn crust | 1 | 1.0 cm thick | Cobble; greenstone | One dark-brown presumably greenstone cobble covered by a 1.0 cm thick Mn crust with an irregular surface showing botryoidal growth | MNHN_GS_DR79-0020_3_small.JPG |
| MD20-23C | MNHN_GS_DR79-0020 | MD-DR790020-1-B | 0.0 | Surface | Mn crust | 1 | 1.0 cm thick | Cobble; greenstone | One dark-brown presumably altered greenstone cobble covered by a 1.0 cm thick Mn crust with an irregular surface showing botryoidal growth | MNHN_GS_DR79-0020_6_small.JPG |
| MD20-24C | MNHN_GS_DR79-0021 | MD-DR790021-1-A | 0.0 | Surface | Fe-Mn crust | 1 | Rock; basalt | One altered basalt cobble covered by a brown Fe-Mn crust with gritty surface | MNHN_GS_DR79-0021_1_small.JPG | |
| MD20-24C | MNHN_GS_DR79-0021 | MD-DR790021-2-A | 0.0 | Surface | Fe-Mn coating | 1 | 0.1-0.5 cm thick | Rock; basalt | One massive basalt cobble covered by a dark-borwn Fe-Mn coating (0.1 cm thick) with granular surface | MNHN_GS_DR79-0021_2_small.JPG |
| MD35-34 | MNHN_GS_DR83-0023 | MD-DR830023-1-A | 0.0 | Surface | Fe-Mn crust | 1 | 3.0 cm thick | Rock; chert | One large alveolar chert fragment covered with a reddish-brown Fe-Mn crust (3.0 cm thick) with an irregular surface showing botryoidal growth and colonial organisms | MNHN_GS_DR83-0023_1_.JPG |
| MD35-38 | MNHN_GS_DR83-0024 | MD-DR830024-1-A | 0.0 | Surface | Mn coating | 1 | 0.1 cm thick | Rock; claystone | One block of white chalk and one block of claystone with irregular black Mn coating (0.1 cm thick) | MNHN_GS_DR83-0024_2_.JPG |
| MD39-12 | MNHN_GS_DR84-0026 | MD-DR840026-1-A | 0.0 | Surface | Mn crust | 1 | 5.0 cm thick | Rock; basalt | One basalt with a layered black Mn crust with pronounced botryoidal surface (5.0 cm thick) | MNHN_GS_DR84-0026_4_small.JPG |
| MD39-15 | MNHN_GS_DR84-0027 | MD-DR840027-1-A | 0.0 | Surface | Fe-Mn staining | 2 | Rock; tuff | 2 tuffite blocks. One with red ferruginous staining and the other one with brown Fe-Mn staining in some alveoles of its gritty surface | MNHN_GS_DR84-0027_3_.JPG | |
| MD39-17d | MNHN_GS_DR84-0028 | MD-DR840028-1-A | 0.0 | Surface | Mn crust | 1 | 1.5 cm thick | Rock; tuff | One tuffite fragment with rather thick black Mn crust (1.5 cm thick) with irregular crusty surface | MNHN_GS_DR84-0028_3_.JPG |
| MD39-24a | MNHN_GS_DR84-0032 | MD-DR840032-1-A | 0.0 | Surface | Mn coating | 1 | Thin | Rock; mudstone | One block of calcareous mudstone with black Mn lining inside several organism burrows | MNHN_GS_DR84-0032_1_.JPG |
| MD39-24c | MNHN_GS_DR84-0033 | MD-CS840028-1-A | 0.0 | Surface | Fe-Mn crust | 1 | 5.0 cm thick | One brown massive layered Fe-Mn crust (5.0 cm thick) fragment. No substrate is visible | MNHN_GS_DR84-0033_1_small.JPG | |
| MD39-24c | MNHN_GS_DR84-0033 | MD-CS840028-1-B | 0.0 | Surface | Mn crust | 1 | 5.0 cm thick | Rock; limestone | One probably phosphatized limestone fragment covered by a thick black Mn crust (5.0 cm thick) with probable botryoidal surface | MNHN_GS_DR84-0033_6_small.JPG |
| MD39-24c | MNHN_GS_DR84-0033 | MD-CS840028-1-C | 0.0 | Surface | Mn crust | 1 | 2.0 cm thick | Rock; limestone | One chalky limestone fragment covered by a black Mn crust (2.0 cm thick) with a botryoidal surface | MNHN_GS_DR84-0033_8_small.JPG |
| MD39-29 | MNHN_GS_DR84-0036 | MD-DR840036-1-A | 0.0 | Surface | Mn coating | 1 | Thin | Rock; limestone | One limestone fragment with thin Mn coating | MNHN_GS_DR84-0036_1_small.JPG |
| MD39-31 | MNHN_GS_DR84-0037 | MD39-31-1-A | 0.0 | Surface | Mn crust | 1 | 6.0 cm thick | Rock; chert | One thick ferruginous red colored Fe-Mn crust (6.0 cm thick) fragment with gritty surface. Substrate is probably chert | MNHN_GS_DR84-0037_1_small.JPG |
| MD39-32 | MNHN_GS_DR84-0038 | MD-DR840038-1-A | 0.0 | Surface | Fe-Mn coating | 1 | Thin | Rock; basalt | One block of basaltic breccia cemented by a carbonate matrix with scattered brown to black Fe-Mn coating | MNHN_GS_Dr84-0038_2_small.JPG |
| MD48-02 | MNHN_GS_DR86-0039 | MD-DR860039-1-A | 0.0 | Surface | Mn crust | 1 | 2.0 cm thick | Breccia; volcanics | One volcanic breccia fragment with thick dark-brown Mn crust (2.0 cm thick) with apparent smooth surface | MNHN_GS_DR86-0039_6_small.JPG |
| MD48-10 | MNHN_GS_DR86-0040 | MD-DR860040-1-A | 0.0 | Surface | Mn crust | 1 | 0.1 cm thick | Rock; limestone | Bioclastic limestone fragment with thin black gritty surfaced Mn encrustation (0.1 cm thick) in alveoles | MNHN_GS_DR86-0040_3_small.JPG |
| MD48-11 | MNHN_GS_DR86-0041 | MD-DR860041-1-A | 0.0 | Surface | Mn crust | 1 | 3.0 cm thick | Rock; chert | One black Mn crust (3.0 cm thick) fragment. The bottom face of the sample is presented probably showing altered chert | MNHN_GS_DR86-0041_1_small.JPG |
| MD48-14 | MNHN_GS_DR86-0042 | MD-DR860042-1-A | 0.0 | Surface | Mn crust | 1 | 3.0 cm thick | Rock; chert | One chert fragment covered with a black Mn crust (3.0 cm thick) with an smooth surface | MNHN_GS_DR86-0042_1_small.JPG |
| MD48-14 | MNHN_GS_DR86-0042 | MD-DR860042-1-A | 0.0 | Surface | Mn crust | 1 | 1.0 cm thick | Rock; chert | One chert fragment covered with a black Mn crust (1.0 cm thick) with an irregular botryoidal surface | MNHN_GS_DR86-0042_2_small.JPG |
| MD48-15 | MNHN_GS_DR86-0043 | MD48-15-1-A | 0.0 | Surface | Mn crust | 1 | 0.5-1.0 cm thick | Breccia; volcanics | One volcanics breccia fragment with an intermixed complex structured black Mn crust (0.5-1.0 cm thick). Its interstitial structured forms quasi small Mn nodules buried inside the breccia | MNHN_GS_DR86-0043_2_small.JPG |
| MD48-15 | MNHN_GS_DR86-0043 | MD48-15-1-B | 0.0 | Surface | Mn crust | 1 | 1.0-2.0 cm thick | Boulder; chert | One boulder of red cherty material with a black Mn crust (1.0-2.0 cm thick) with probable botryoidal surface. The sample is presented upside-down | MNHN_GS_DR86-0043_4_small.JPG |
| MD48-17 | MNHN_GS_DR86-0044 | MD-DR860044-1-A | 0.0 | Surface | Mn crust | 1 | 2.0 cm thick | Rock; basalt | One basalt block with a thick black Mn crust (2.0 cm thick) | MNHN_GS_DR86-0044_1_small.JPG |
| MD48-17 | MNHN_GS_DR86-0044 | MD-DR860044-1-B | 0.0 | Surface | Mn crust | 1 | 1.0-3.0 cm thick | Breccia; basalt | One basalt breccia block with a black indutated Mn crust (1.0-3.0 cm thick) with probable gritty botryoidal surface | MNHN_GS_DR86-0044_2_small.JPG |
| MD48-19 | MNHN_GS_DR86-0045 | MD-DR860045-1-B | 0.0 | Surface | Mn crust | 1 | 2.0 cm thick | Rock; basalt | One thick black Mn crust (2.0 cm thick) with a cavernous structure and a gritty uneven botryoidal surface. Substrate is probably red palagonite | MNHN_GS_DR86-0045_12_small.JPG |
| MD48-19 | MNHN_GS_DR86-0045 | MD-DR860045-1-C | 0.0 | Surface | Mn crust | 2 | 0.1-0.5 cm thick | Breccia; basalt | Two fragments of weathered (palagonite) basaltic breccia with rather thin (0.1-0.5 cm thick) black Mn crust | MNHN_GS_DR86-0045_3_small.JPG |
| MD48-19 | MNHN_GS_DR86-0045 | MD-DR860045-1-A | 0.0 | Surface | Mn crust | 1 | 1.0 cm thick | Rock; basalt | One basalt lava fragment with an upper red palagonite segment (1.0 cm thick) covered by a 1.0 cm thick black Mn crust | MNHN_GS_DR86-0045_9_small.JPG |
| MD48-25 | MNHN_GS_DR86-0046 | MD48-25-1-A | 0.0 | Surface | Mn crust | 1 | 0.5 cm thick | Rock; basalt | Basalt fragment with a black Mn crust (0.5 cm thick). The sample presents its bottom face | MNHN_GS_DR86-0046_2_.JPG |
| MD64-02 | MNHN_GS_DR90-0047 | MD-DR900047-1-A | 0.0 | Surface | Mn coating | 1 | Thin | Rock; chalk | Two chalk block fragments. One with thin black Mn coating | MNHN_GS_DR90-0047_4_small.JPG |
| MD64-02 | MNHN_GS_DR90-0047 | MD-DR900047-1-B | 0.0 | Surface | Mn coating | 1 | Thin | Pebble; chalk | One white chalk pebble with thin black gritty Mn coating within alveoles | MNHN_GS_DR90-0047_5_small.JPG |
| MD64-03 | MNHN_GS_DR90-0048 | MD-DR900048-1-A | 0.0 | Surface | Mn crust | 1 | 0.2 cm thick | Rock; limestone | One bllock of neritic limestone with a thin gritty black Mn crust (0.2 cm thick) | MNHN_GS_DR90-0048_1_small.JPG |
| MD64-06 | MNHN_GS_DR90-0049 | MD-DR900049-1-A | 0.0 | Surface | Mn staining | 1 | Rock; limestone | One white chalk block with black Mn staining within alveoles | MNHN_GS_DR90-0049_1_small.JPG | |
| MD64-08 | MNHN_GS_DR90-0051 | MD-DR900051-1-A | 0.0 | Surface | Mn crust | 2 | 0.1-1.0 cm thick | Rock; basalt | 2 basalt fragments with a black Mn crust (0.1-1.0 cm thick). One of the crust has a characteristic botryoidal surface | MNHN_GS_DR90-0051_1_small.JPG |
| MD64-12 | MNHN_GS_DR90-0053 | MD-DR900053-1-A | 0.0 | Surface | Mn crust | 1 | 0.2 cm thick | Rock; limestone and Breccia; basalt | One bioclastic limestone block with thin black Mn crust (0.2 cm thick) with rather smooth botryoidal surface | MNHN_GS_DR90-0053_1_small.JPG |
| MD64-12 | MNHN_GS_DR90-0053 | MD-DR900053-1-B | 0.0 | Surface | Mn crust | 1 | Thin | Rock; limestone and Breccia; basalt | 2 bioclastic limestone block. One with thin black gritty Mn crust on surface and in alveoles | MNHN_GS_DR90-0053_2_small.JPG |
| MD64-17 | MNHN_GS_DR90-0056 | MD-DR900056-1-A | 0.0 | Surface | Mn crust | 3 | 0.2-2.0 cm thick | Breccia; basalt | 3 altered basalt breccia fragments with a black Mn crust (0.2-2.0 cm thick) with botryoidal gritty surface | MNHN_GS_DR90-0056_2_small.JPG |
| MD64-17 | MNHN_GS_DR90-0056 | MD-DR900056-1-B | 0.0 | Surface | Mn crust | 1 | 1.0 cm thick | Rock; basalt | One basalt fragment with a black Mn crust (1.0 cm thick) with a gritty surface | MNHN_GS_DR90-0056_4_small.JPG |
| MD64-28 | MNHN_GS_DR90-0057 | MD-DR900057-1-A | 0.0 | Surface | Mn crust | 1 | 0.2 cm thick | Breccia; basalt | 2 basalt breccia blocks. One with a thin (0.2 cm thick) black shiny Mn crust with smooth surface | MNHN_GS_DR90-0057_1_small.JPG |
| MD73-38 | MNHN_GS_DR92-0068 | MD-DR920068-1-A | 0.0 | Surface | Fe-Mn coating | 3 | Thin | Rock; basalt,claystone | 3 pieces of laminated carbonaceous claystone with brown to dark-brown Fe-Mn coating with gritty surface | MNHN_GS_DR92-0068_2_small.jpg |
| MD20-19B | MNHN_GS_SI79-0011 | MD-SI790011-1-A | 0.0 | Surface | Mn nodule | 2 | 3.0-10.0 cm | Core; consolidated sediment | 2 contrasting grayish-yellow Mn nodules. The small Mn nodule (3.0 cm) has a polylobate shape witha gritty surface and a clayey core surroundede by a 1.0 cm thick black rind. The large Mn nodule (10.0 cm) is globally ellipsoidal with a gritty botryoidal surface | MNHN_GS_SI79-0011_1_small.JPG |
| MD20-19D | MNHN_GS_SI79-0012 | MD-SI790012-1-A | 0.0 | Surface | Mn nodule | 2 | 1.5-4.0 cm | One black spherical Mn nodule with rough slightly botryoidal surface (4.0 cm) and one small black polylobate Mn nodule (1.5 cm) with rather smooth surface | MNHN_GS_SI79-0012_1_small.JPG | |
| MD20-19F | MNHN_GS_SI79-0013 | MD-SI790013-1-A | 0.5 | Buried | Mn nodule | 2 | 3.0 cm | On brown-black spherical Mn nodule (3.0cm) with rough slightly botryoidal surface and one polylobate brown-black Mn nodule (3.0 cm) resulting from the accretion of smaller 1.0 cm nodules with rather smooth botryoidal surface | MNHN_GS_SI79-0013_1_small.JPG | |
| MD20-19F | MNHN_GS_SI79-0013 | MD-SI790013-2-A | 0.5 | Buried | Mn crust | 1 | 3.0 cm thick | Rock; claystone | One gray-brown Mn crust with rough surface and claystone substrate (3.0 cm thick) | MNHN_GS_SI79-0013_2_small.JPG |
| MD20-28B | MNHN_GS_SI79-0017 | MD-SI790017-1-A | 0.2 | Buried | Mn nodule | 3 | 5.0-1.5 cm | Core; consolidate sediment | One brown-black ellipsoidal Mn nodule with clayey core and a 0.5 cm thick external rind. Two smaller brown black Mn nodules (1.5 cm) either spherical or polylobate. One si sectionned and shows a clayey core with a 0.5 cm thick external rind | MNHN_GS_SI79-0017_1_small.JPG |