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Askin, R A; Raine, J Ian (2000): Cenozoic terrestrial palynomorphs from the late Oligocene to early Miocene section of sediment core CRP-2/2A (Table 1). PANGAEA,, Supplement to: Askin, RA; Raine, JI (2000): Oligocene and early Miocene terrestrial palynology of the Cape Roberts drillhole CRP-2/2A, Victoria Land Basin, Antarctica. Terra Antartica, 7(4), 493-501, hdl:10013/epic.28257.d001

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Sparse terrestrial palynomorphs (spores and pollen) were recovered from glacigene Lower Miocene and Oligocene core samples from the Cape Roberts Project (CRP) drillhole CRP-2/2A, Victoria Land Basin, Antarctica. Rarity of palynomorphs probably results from the spares periglacial vegetation in the surrounding landscape at the time of deposition, as well as dilution from rapid sediment accumulation. The Miocene and Late Oligocene vegetation is interpreted as including herb-moss tundra with low-growing woody plants (including Nothofagus and podocarp conifers) in more protected areas, similar to that encountered in the Miocene of CRP-1. Species richness and numbers of specimens increase downhole, a trend that begins very gradually below ~307 mbsf, and increases below ~443 mbsf through the Early Oligocene. These lower assemblages reflect low diversity woody vegetation dominated by several species of Nofhofagus and podocarps, growing in somewhat milder conditions, though still cold temperate to periglacial in the Early Oligocene. The CRP-2/2A core provides new biostratigraphical information, such as the First Appearance Datums (FADS) of Tricolpites sp. a near the Oligocene/Miocene boundary, and Marchantiaceae in the Early/Late Oligocene transition: these are taxa that along with N. lachlaniae, Coptospora spp. and Podocarpidites sp.b characterize assemblages recovered from outcrops of the Pliocene Sirius Group in the Transantarctic Mountains. Some elements of the extremely hardy periglacial tundra vegetation that survived in Antarctica into the Pliocene had their origin in the Oligocene during a time of deteriorating (colder, drier) climatic conditions. The CRP results highlight the long persistence of this tundra vegetation, through approximately 30 million years of dynamically changing climatic conditions.
Rare Jurassic and more common Permian-Triassic spores and pollen occur sporadically throughout the core. These are derived from Jurassic Ferrar Group sediments, and from the Permian-Triassic Victoria Group, upper Beacon Supergroup. Higher frequencies of reworked Beacon palynomorphs and coaly organic matter below ~307 mbsf indicate greater erosion of the Beacon Supergroup for this lower part of the core. A color range from black, severely metamorphosed specimens, to light-colored, yellow (indicating low thermal alteration), reworked Permian palynomorphs, indicates local provenance in the dolerite-intruded Beacon strata of the Transantarctic Mountains, as well as areas (now sub-ice) of Beacon strata with little or no associated dolerite well inland (cratonwards) of the present Transantarctic Mountains.
Latitude: -77.005980 * Longitude: 163.719450
Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00
Minimum Elevation: -177.9 m * Maximum Elevation: -177.9 m
CRP-2A (14.2 km at 096° true from Cape Roberts) * Latitude: -77.005980 * Longitude: 163.719450 * Date/Time Start: 1998-10-16T07:30:00 * Date/Time End: 1998-11-25T14:20:00 * Elevation: -177.9 m * Recovery: 624 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: CRP-2 * Basis: Sampling/drilling from ice * Method/Device: Core wireline system (CWS) * Comment: 921 m at 284° from CRP-1. Sea-ice thickness: 2.0 m (1 Oct) to 2.2 m (23 Nov). Sea riser embedded to 13.03 mbsf. Lateral ice movement: 9.87 m to east from 17 Oct to 23 Nov. HQ core to 199.31 mbsf. NQ core to 624.15 mbsf. 13.03 to 45.97 mbsf, 11.29 m (34%) partially following CRP-2. 45.07 to 624.15 mbsf, 548.67 m (95%) new hole. Deepest core-lithology: hard sandy siltstone. Deepest core-age: earliest Oligocene (ca. 33 Ma on diatoms, nannofossils and dinoflagellates)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Depth, top/minDepth topmAskin, R A
2Depth, bottom/maxDepth botmAskin, R A
3Assamiapollenites incognitusAssamiapollenites in#Askin, R ACounting, palynology
4Cyperaceaepollis sp.Cyperaceaepollis sp.#Askin, R ACounting, palynology
5Cibotiidites sp.Cibotiidites sp.#Askin, R ACounting, palynology
6Coptospora spp.Coptospora spp.#Askin, R ACounting, palynology
7Cyathidites minorCyathidites minor#Askin, R ACounting, palynology
8Dacrycarpites sp.Dacrycarpites sp.#Askin, R ACounting, palynology
9Liliacidites variegatusLiliacidites variega#Askin, R ACounting, palynology
10MarchantiaceaeMarchantiaceae#Askin, R ACounting, palynology
11Microalatidites paleogenicusMicroalatidites pale#Askin, R ACounting, palynology
12Microalatidites sp.Microalatidites sp.#Askin, R ACounting, palynology
13Microcachrydites antarcticusM. antarcticus#Askin, R ACounting, palynology
14Nothofagidites asperusN. asperus#Askin, R ACounting, palynology
15Nothofagidites flemingiiN. flemingii#Askin, R ACounting, palynology
16Nothofagidites cf. flemingiiN. cf. flemingii#Askin, R ACounting, palynology
17Nothofagidites lachlaniaeN. lachlaniae#Askin, R ACounting, palynology
18Nothofagidites matauraensisNothofagidites matau#Askin, R ACounting, palynology
19Nothofagidites spp.Nothofagidites spp.#Askin, R ACounting, palynologybrassii group
20Nothofagidites spp.Nothofagidites spp.#Askin, R ACounting, palynologyfusca group
21Osmundacidites wellmaniiOsmundacidites wellm#Askin, R ACounting, palynology
22Phormium sp.Phormium sp.#Askin, R ACounting, palynology
23Phyllocladidites mawsoniiPh. mawsonii#Askin, R ACounting, palynology
24Podosporites erugatusPodosporites erugatu#Askin, R ACounting, palynologyQuestionable
25Podocarpidites cf. exiguusP. cf. exiguus#Askin, R ACounting, palynology
26Podocarpidites ellipticusP. ellipticus#Askin, R ACounting, palynology
27Podocarpidites cf. torquatusP. cf. torquatus#Askin, R ACounting, palynology
28Podocarpidites sp.Podocarpidites sp.#Askin, R ACounting, palynologya
29Podocarpidites sp.Podocarpidites sp.#Askin, R ACounting, palynologyb
30Podocarpidites spp.Podocarpidites spp.#Askin, R ACounting, palynology
31RanunculaceaeRanae#Askin, R ACounting, palynologyQuestionable
32Ricciaesporites sp.Ricciaesporites sp.#Askin, R ACounting, palynology
33Stereisporites antiquasporitesStereisporites antiq#Askin, R ACounting, palynology
34StylidiaceaeStylidiaceae#Askin, R ACounting, palynologyQuestionable
35Trichotomosulcites subgranulatusT. subgranulatus#Askin, R ACounting, palynology
36Tricolpites sp.Tricolpites sp.#Askin, R ACounting, palynologya
37Tricolpites sp.Tricolpites sp.#Askin, R ACounting, palynologyb
38Tricolpites sp.Tricolpites sp.#Askin, R ACounting, palynologyc
39Tricolpites sp.Tricolpites sp.#Askin, R ACounting, palynology
40Spores, pteridophyte indeterminataSpores pterid#Askin, R ACounting, palynology
41Pollen, angiosperm indeterminataPollen angiosperm indet#Askin, R ACounting, palynology
42Microthyriaceae (Fungi)Microthyriaceae#Askin, R ACounting, palynology
363 data points

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