Pospichal, James J (1991): Abundance of calcareous nannofossils in ODP Hole 121-752B (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.729024, Supplement to: Pospichal, JJ (1991): Calcareous nannofossils across Cretaceous/Tertiary boundary at Site 752, eastern Indian Ocean. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 395-413, https://doi.org/10.2973/odp.proc.sr.121.148.1991
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Abstract:
A biostratigraphically complete Cretaceous/Tertiary boundary was recovered during Ocean Drilling Program Leg 121. The boundary, cored in ODP Hole 752B on Broken Ridge, is the most expanded deep-sea section yet recovered by ODP/DSDP. The initial Danian subzone, CP la, spans nearly 5 m and the underlying uppermost Maestrichtian Nephrolithus frequens Zone extends 50 m below the boundary. The paleolatitude of Broken Ridge at Cretaceous/Tertiary time is estimated at 50°-55°S which includes this site among the latest in a series of complete or near complete high southern latitude Cretaceous/Tertiary boundary sections recovered by ODP (Leg 113 Site 690 and Leg 119 Site 738).
The boundary at Site 752 lies at the base of a thick (6-6.5 m) volcanic ash unit composed of multiple ash layers which overlies indurated Maestrichtian chalks. Magnetostratigraphy indicates that the boundary lies within Subchron 29R, which is the case for all other known complete sections for which the polarity has been determined. Anomalous abundances of the trace element iridium are present at the boundary. A second iridium peak, 80 cm above the boundary, corresponds to an increase in redeposited Cretaceous nannofossils.
The nannofossil succession is similar to that found at previously studied austral high-latitude ODP drill sites with few differences due to the more northerly location of this site. Individual nannofossil species were counted and placed into three categories. A plot of the percent abundance of Cretaceous, Tertiary, and 'survivor' groups illustrates the rapid replacement of the Cretaceous nannoflora by 'survivor' forms beginning at the boundary and the dominance of this latter group through the initial Danian biozone. This 'survivor' or opportunistic assemblage is then rapidly replaced by newly evolved Tertiary taxa. The assemblage of the uppermost Maestrichtian is biased toward dissolution-resistant forms such as Micula decussata. In those few intervals where preservation is good, the dissolution susceptible species, Prediscosphaera stoveri, is more prevalent and overall diversity of the assemblage is higher. The 'survivor' assemblage is dominated by Zygodiscus sigmoides and Thoracosphaera. The Tertiary assemblage consists of rare Biantholithus sparsus, the first of this group to appear. It is followed several meters upsection by Cruciplacolithus primus. Cruciplacolithus tenuis and small Prinsius spp. dominate the assemblage beginning at about 5 m above the boundary.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -30.891000 * Longitude: 93.577500
Date/Time Start: 1988-05-18T09:00:00 * Date/Time End: 1988-05-22T12:30:00
Minimum DEPTH, sediment/rock: 349.02 m * Maximum DEPTH, sediment/rock: 373.05 m
Event(s):
121-752B * Latitude: -30.891000 * Longitude: 93.577500 * Date/Time Start: 1988-05-18T09:00:00 * Date/Time End: 1988-05-22T12:30:00 * Elevation: -1097.0 m * Penetration: 435.6 m * Recovery: 112.34 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 158 m cored; 0 m drilled; 71.1 % recovery
Comment:
<1 = present but not within 500 count
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Epoch | Epoch | Pospichal, James J | |||
| 2 | Nannofossil zone | Nannos zone | Pospichal, James J | |||
| 3 | Sample code/label | Sample label | Pospichal, James J | DSDP/ODP/IODP sample designation | ||
| 4 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 5 | Nannofossils preservation | Nannos preserv | Pospichal, James J | Smear slide analysis | G = good, M = moderate, P = poor | |
| 6 | Nannofossils indeterminata | Nannos indet | Pospichal, James J | Smear slide analysis | V = very abundant (>10 specimens per field of view at 1560 X), A = abundant (6-10 specimens per field), C = common (1-5 specimen per field), F = few (one specimen per 2-10 fields), R = rare (one specimen per >10 fields of view) | |
| 7 | Nannofossils, tertiary | Nannos tertiary | # | Pospichal, James J | Smear slide analysis | |
| 8 | Nannofossils, cretaceous | Nannos cretaceous | # | Pospichal, James J | Smear slide analysis | |
| 9 | Nannofossils, survivor | Nannos survivor | # | Pospichal, James J | Smear slide analysis | |
| 10 | Nannofossils | Nannos | # | Pospichal, James J | Smear slide analysis | total |
| 11 | Acuturris scotus | A. scotus | # | Pospichal, James J | Smear slide analysis | |
| 12 | Ahmuellerella octoradiata | A. octoradiata | # | Pospichal, James J | Smear slide analysis | |
| 13 | Arkhangelskiella cymbiformis | A. cymbiformis | # | Pospichal, James J | Smear slide analysis | |
| 14 | Bidiscus rotatorius | B. rotatorius | # | Pospichal, James J | Smear slide analysis | |
| 15 | Biscutum constans | B. constans | # | Pospichal, James J | Smear slide analysis | |
| 16 | Chiastozygus amphipons | C. amphipons | # | Pospichal, James J | Smear slide analysis | |
| 17 | Chiastozygus sp. | Chiastozygus sp. | # | Pospichal, James J | Smear slide analysis | |
| 18 | Corollithion rhombicum | C. rhombicum | # | Pospichal, James J | Smear slide analysis | |
| 19 | Cretarhabdus conicus | C. conicus | # | Pospichal, James J | Smear slide analysis | |
| 20 | Cribrosphaerella daniae | C. daniae | # | Pospichal, James J | Smear slide analysis | |
| 21 | Cribrosphaerella ehrenbergii | C. ehrenbergii | # | Pospichal, James J | Smear slide analysis | |
| 22 | Eiffellithus turriseiffelii | E. turriseiffelii | # | Pospichal, James J | Smear slide analysis | |
| 23 | Eiffellithus sp. | Eiffellithus sp. | # | Pospichal, James J | Smear slide analysis | |
| 24 | Gartnerago spp. | Gartnerago spp. | # | Pospichal, James J | Smear slide analysis | |
| 25 | Kamptnerius magnificus | K. magnificus | # | Pospichal, James J | Smear slide analysis | |
| 26 | Lithraphidites quadratus | L. quadratus | # | Pospichal, James J | Smear slide analysis | |
| 27 | Micula decussata | M. decussata | # | Pospichal, James J | Smear slide analysis | |
| 28 | Nephrolithus frequens frequens | N. frequens frequens | # | Pospichal, James J | Smear slide analysis | |
| 29 | Nephrolithus frequens miniporus | N. frequens miniporus | # | Pospichal, James J | Smear slide analysis | |
| 30 | Prediscosphaera cretacea | P. cretacea | # | Pospichal, James J | Smear slide analysis | |
| 31 | Prediscosphaera spinosa | P. spinosa | # | Pospichal, James J | Smear slide analysis | |
| 32 | Prediscosphaera stoveri | P. stoveri | # | Pospichal, James J | Smear slide analysis | |
| 33 | Watznaueria barnesae | W. barnesae | # | Pospichal, James J | Smear slide analysis | |
| 34 | Zygodiscus spiralis | Z. spiralis | # | Pospichal, James J | Smear slide analysis | |
| 35 | Biscutum notaculum | B. notaculum | # | Pospichal, James J | Smear slide analysis | reworked |
| 36 | Nephrolithus corystus | N. corystus | # | Pospichal, James J | Smear slide analysis | reworked |
| 37 | Phanulithus obscurus | P. obscurus | # | Pospichal, James J | Smear slide analysis | reworked |
| 38 | Reinhardtites levis | R. levis | # | Pospichal, James J | Smear slide analysis | reworked |
| 39 | Tranolithus phacelosus | T. phacelosus | # | Pospichal, James J | Smear slide analysis | reworked |
| 40 | Zygodiscus compactus | Z. compactus | # | Pospichal, James J | Smear slide analysis | reworked |
| 41 | Zygodiscus diplogrammus | Z. diplogrammus | # | Pospichal, James J | Smear slide analysis | reworked |
| 42 | Biscutum castrorum | B. castrorum | # | Pospichal, James J | Smear slide analysis | |
| 43 | Braarudosphaera bigelowii | B. bigelowii | # | Pospichal, James J | Smear slide analysis | |
| 44 | Cyclagelosphaera reinhardtii | C. reinhardtii | # | Pospichal, James J | Smear slide analysis | C. reinhardtii/ C. alta |
| 45 | Lapidaecassis sp. | Lapidaecassis sp. | # | Pospichal, James J | Smear slide analysis | |
| 46 | Markalius apertus | M. apertus | # | Pospichal, James J | Smear slide analysis | |
| 47 | Markalius inversus | M. inversus | # | Pospichal, James J | Smear slide analysis | |
| 48 | Neocrepidolithus cruciatus | N. cruciatus | # | Pospichal, James J | Smear slide analysis | |
| 49 | Neocrepidolithus fossus | N. fossus | # | Pospichal, James J | Smear slide analysis | |
| 50 | Neocrepidolithus neocrassus | N. neocrassus | # | Pospichal, James J | Smear slide analysis | |
| 51 | Thoracosphaera spp. | Thoracosphaera spp. | # | Pospichal, James J | Smear slide analysis | |
| 52 | Zygodiscus sigmoides | Z. sigmoides | # | Pospichal, James J | Smear slide analysis | |
| 53 | Zygolithus crux | Z. crux | # | Pospichal, James J | Smear slide analysis | |
| 54 | Zygolithus sp. | Zygolithus sp. | # | Pospichal, James J | Smear slide analysis | rotated cross |
| 55 | Biantholithus sparsus | B. sparsus | # | Pospichal, James J | Smear slide analysis | |
| 56 | Coccolithus cavus | C. cavus | # | Pospichal, James J | Smear slide analysis | C. cavus / C. pelagicus |
| 57 | Cruciplacolithus primus | C. primus | # | Pospichal, James J | Smear slide analysis | <5 µm |
| 58 | Cruciplacolithus primus | C. primus | # | Pospichal, James J | Smear slide analysis | >5 µm |
| 59 | Cruciplacolithus tenuis | C. tenuis | # | Pospichal, James J | Smear slide analysis | >7 µm |
| 60 | Prinsius tenuiculum | P. tenuiculum | # | Pospichal, James J | Smear slide analysis | P. tenuiculum / P. dimorphosus |
| 61 | Futyania petalosa | F. petalosa | # | Pospichal, James J | Smear slide analysis | |
| 62 | Placoliths, small | Placoliths small | # | Pospichal, James J | Smear slide analysis | Miscellaneous small oval placoliths |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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4087 data points
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