Pospichal, James J; Bralower, Timothy J (1992): Abundance of calcareous nannofossils in ODP Hole 122-761C (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.729258, Supplement to: Pospichal, JJ; Bralower, TJ (1992): Calcareous nannofossils across the Cretaceous/Tertiary boundary, Site 761, Northwest Australia margin. In: von Rad, U; Haq, BU; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 122, 735-751, https://doi.org/10.2973/odp.proc.sr.122.187.1992
Always quote citation above when using data! You can download the citation in several formats below.
Published: 1992 (exact date unknown) • DOI registered: 2009-12-15
Abstract:
A biostratigraphically complete (all nannofossil biozones present) Cretaceous/Tertiary boundary was recovered at Site 761 on the Wombat Plateau, northwest Australian margin, during Ocean Drilling Program Leg 122. A quantitative study of calcareous nannofossils on closely spaced samples across the boundary reveals a rapid change in assemblages in a similar fashion to other Cretaceous/Tertiary boundary sites. Nannofossil species were placed into three categories: Tertiary, Cretaceous, and 'survivors'. The rapid sequential turnover in these assemblages is as follows: Cretaceous species are abruptly replaced at the boundary by opportunistic survivor species, which in turn are abruptly replaced by newly evolved Tertiary taxa. The uppermost Maestrichtian assemblage is distinctly mid-latitudinal with few Micula murus and rare to few Nephrolithus frequens. The nannofossil assemblage immediately above the boundary is dominated by an abundance bloom of Cyclagelosphaera spp. No Thoracosphaera or Braarudosphaera abundance blooms are present as at many other localities.
The change from a survivor- to Tertiary-dominated assemblage is coincident with the CPla/CPlb nannofossil subzonal boundary, which is marked by the simultaneous first occurrence of several species including Cruciplacolithus tenuis and C. primus. The latter is found to first occur below C. tenuis in the most complete Cretaceous/Tertiary sections. A hiatus between Subzones CPla and CPlb is interpreted to explain this discrepancy.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -16.737000 * Longitude: 115.535000
Date/Time Start: 1988-07-21T09:00:00 * Date/Time End: 1988-07-25T02:00:00
Minimum Elevation: -2179.0 m * Maximum Elevation: -2179.0 m
Event(s):
122-761C * Latitude: -16.737000 * Longitude: 115.535000 * Date/Time Start: 1988-07-21T09:00:00 * Date/Time End: 1988-07-25T02:00:00 * Elevation: -2179.0 m * Penetration: 436.7 m * Recovery: 72.24 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg122 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 33 cores; 436.7 m cored; 0 m drilled; 16.5 % 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 | Nannofossils, cretaceous | Nannos cretaceous | # | Pospichal, James J | Smear slide analysis | |
| 5 | Nannofossils, tertiary | Nannos tertiary | # | Pospichal, James J | Smear slide analysis | |
| 6 | Nannofossils, survivor | Nannos survivor | # | Pospichal, James J | Smear slide analysis | |
| 7 | Nannofossils | Nannos | # | Pospichal, James J | Smear slide analysis | total |
| 8 | Actinozygus regularis | A. regularis | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 9 | Arkhangelskiella cymbiformis | A. cymbiformis | # | Pospichal, James J | Smear slide analysis | A. cymbiformis / A. specillata, Cretaceous |
| 10 | Bidiscus rotatorius | B. rotatorius | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 11 | Biscutum sp. | Biscutum sp. | # | Pospichal, James J | Smear slide analysis | var. 1, Cretaceous |
| 12 | Biscutum sp. | Biscutum sp. | # | Pospichal, James J | Smear slide analysis | var. 2, Cretaceous |
| 13 | Chiastozygus amphipons | C. amphipons | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 14 | Chiastozygus sp. | Chiastozygus sp. | # | Pospichal, James J | Smear slide analysis | Chiastozygus sp. aff. C. interruptus, Cretaceous |
| 15 | Chiastozygus spp. | Chiastozygus spp. | # | Pospichal, James J | Smear slide analysis | genus questionable, Cretaceous |
| 16 | Corollithion exiguum | C. exiguum | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 17 | Corollithion madagaskarensis | C. madagaskarensis | # | Pospichal, James J | Smear slide analysis | genus questionable, Cretaceous |
| 18 | Corollithion rhombicum | C. rhombicum | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 19 | Cretarhabdus conicus | C. conicus | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 20 | Cretarhabdus crenulatus | C. crenulatus | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 21 | Cretarhabdus surirellus | C. surirellus | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 22 | Cribrosphaerella daniae | C. daniae | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 23 | Cribrosphaerella ehrenbergii | C. ehrenbergii | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 24 | Cylindralithus spp. | Cylindralithus spp. | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 25 | Eiffellithus turriseiffelii | E. turriseiffelii | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 26 | Kamptnerius magnificus | K. magnificus | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 27 | Lithraphidites quadratus | L. quadratus | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 28 | Lucianorhabdus cayeuxii | L. cayeuxii | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 29 | Manivitella pemmatoidea | M. pemmatoidea | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 30 | Microrhabdulus decoratus | M. decoratus | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 31 | Micula decussata | M. decussata | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 32 | Micula murus | M. murus | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 33 | Nephrolithus frequens | N. frequens | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 34 | Nephrolithus frequens miniporus | N. frequens miniporus | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 35 | Prediscosphaera arkhangelskyi | P. arkhangelskyi | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 36 | Prediscosphaera cretacea | P. cretacea | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 37 | Prediscosphaera grandis | P. grandis | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 38 | Prediscosphaera spinosa | P. spinosa | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 39 | Prediscosphaera stoveri | P. stoveri | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 40 | Tranolithus minimus | T. minimus | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 41 | Vagalapilla aachena | V. aachena | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 42 | Watznaueria barnesae | W. barnesae | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 43 | Zeugrhabdotus embergeri | Z. embergeri | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 44 | Zygodiscus spiralis | Z. spiralis | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 45 | Zygodiscus sp. | Zygodiscus sp. | # | Pospichal, James J | Smear slide analysis | Cretaceous |
| 46 | Biscutum castrorum | B. castrorum | # | Pospichal, James J | Smear slide analysis | survivors |
| 47 | Braarudosphaera bigelowii | B. bigelowii | # | Pospichal, James J | Smear slide analysis | survivors |
| 48 | Cyclagelosphaera reinhardtii | C. reinhardtii | # | Pospichal, James J | Smear slide analysis | C. reinhardtii / C. alta, survivors |
| 49 | Lapideacassis sp. | Lapideacassis sp. | # | Pospichal, James J | Smear slide analysis | survivors |
| 50 | Markalius apertus | M. apertus | # | Pospichal, James J | Smear slide analysis | survivors |
| 51 | Markalius inversus | M. inversus | # | Pospichal, James J | Smear slide analysis | survivors |
| 52 | Neocrepidolithus spp. | Neocrepidolithus spp. | # | Pospichal, James J | Smear slide analysis | survivors |
| 53 | Neocrepidolithus fossus | N. fossus | # | Pospichal, James J | Smear slide analysis | survivors |
| 54 | Thoracosphaera spp. | Thoracosphaera spp. | # | Pospichal, James J | Smear slide analysis | survivors |
| 55 | Zygodiscus sigmoides | Z. sigmoides | # | Pospichal, James J | Smear slide analysis | survivors |
| 56 | Biantholithus sparsus | B. sparsus | # | Pospichal, James J | Smear slide analysis | Tertiary |
| 57 | Chiasmolithus danicus | C. danicus | # | Pospichal, James J | Smear slide analysis | Tertiary |
| 58 | Coccolithus pelagicus | C. pelagicus | # | Pospichal, James J | Smear slide analysis | C. pelagicus / C. cavus, Tertiary |
| 59 | Coccolithus subpertusus | C. subpertusus | # | Pospichal, James J | Smear slide analysis | Tertiary |
| 60 | Coccolithus sp. | Coccolithus sp. | # | Pospichal, James J | Smear slide analysis | Tertiary |
| 61 | Cruciplacolithus primus | C. primus | # | Pospichal, James J | Smear slide analysis | large, Tertiary |
| 62 | Cruciplacolithus primus | C. primus | # | Pospichal, James J | Smear slide analysis | small, Tertiary |
| 63 | Cruciplacolithus tenuis | C. tenuis | # | Pospichal, James J | Smear slide analysis | Tertiary |
| 64 | Neochiastozygus sp. | Neochiastozygus sp. | # | Pospichal, James J | Smear slide analysis | Tertiary |
| 65 | Prinsius dimorphosus | P. dimorphosus | # | Pospichal, James J | Smear slide analysis | Tertiary |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2274 data points
Download Data
View dataset as HTML (shows only first 2000 rows)