Step-wise extinctions at the Cretaceous-Tertiary boundary and their climatic implications
A comparative study of planktonic foraminifera and radiolarian assemblages from the Cretaceous-Tertiary (K-T) boundary section of the Beloc Formation in the southern Peninsula of Haiti, and the lowermost Danian sequence of the Micara Formation in southern Cuba reveals a remarkable pattern of step-wi...
Main Author: | |
---|---|
Format: | Other/Unknown Material |
Language: | unknown |
Published: |
1988
|
Subjects: | |
Online Access: | http://hdl.handle.net/2060/19890011983 |
id |
ftnasantrs:oai:casi.ntrs.nasa.gov:19890011983 |
---|---|
record_format |
openpolar |
spelling |
ftnasantrs:oai:casi.ntrs.nasa.gov:19890011983 2023-05-15T18:00:54+02:00 Step-wise extinctions at the Cretaceous-Tertiary boundary and their climatic implications Maurrasse, Florentin J-M. R. Unclassified, Unlimited, Publicly available JAN 1, 1988 application/pdf http://hdl.handle.net/2060/19890011983 unknown Document ID: 19890011983 Accession ID: 89N21354 http://hdl.handle.net/2060/19890011983 No Copyright CASI LIFE SCIENCES (GENERAL) Lunar and Planetary Inst., Global Catastrophes in Earth History: An Interdisciplinary Conference on Impacts, Volcanism, and Mass Mortality; p 117 1988 ftnasantrs 2015-03-15T05:57:13Z A comparative study of planktonic foraminifera and radiolarian assemblages from the Cretaceous-Tertiary (K-T) boundary section of the Beloc Formation in the southern Peninsula of Haiti, and the lowermost Danian sequence of the Micara Formation in southern Cuba reveals a remarkable pattern of step-wise extinctions. This pattern is consistent in both places despite the widely different lithologies of the two formations. Because of a step-wise extinction and the delayed disappearance of taxa known to be more representative of cooler water realms, it is inferred that a cooling trend which characterized the close of the Maastrichtian and the onset of the Tertiary had the major adverse effect on the existing biota. Although repetitive lithologic and faunal fluctuations throughout the Maastrichtian sediments found at Deep Sea Drilling Project (DSDP) site 146/149 in the Caribbean Sea indicate variations reminiscent of known climatically induced cycles in the Cenozoic, rapid biotic succession appears to have taken place during a crisis period of a duration greater than 2 mission years. Widespread and abundant volcanic activities recorded in the Caribbean area during the crisis period gives further credence to earlier contention that intense volcanism may have played a major role in exhacerbating pre-existing climatic conditions during that time. Other/Unknown Material Planktonic foraminifera NASA Technical Reports Server (NTRS) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
LIFE SCIENCES (GENERAL) |
spellingShingle |
LIFE SCIENCES (GENERAL) Maurrasse, Florentin J-M. R. Step-wise extinctions at the Cretaceous-Tertiary boundary and their climatic implications |
topic_facet |
LIFE SCIENCES (GENERAL) |
description |
A comparative study of planktonic foraminifera and radiolarian assemblages from the Cretaceous-Tertiary (K-T) boundary section of the Beloc Formation in the southern Peninsula of Haiti, and the lowermost Danian sequence of the Micara Formation in southern Cuba reveals a remarkable pattern of step-wise extinctions. This pattern is consistent in both places despite the widely different lithologies of the two formations. Because of a step-wise extinction and the delayed disappearance of taxa known to be more representative of cooler water realms, it is inferred that a cooling trend which characterized the close of the Maastrichtian and the onset of the Tertiary had the major adverse effect on the existing biota. Although repetitive lithologic and faunal fluctuations throughout the Maastrichtian sediments found at Deep Sea Drilling Project (DSDP) site 146/149 in the Caribbean Sea indicate variations reminiscent of known climatically induced cycles in the Cenozoic, rapid biotic succession appears to have taken place during a crisis period of a duration greater than 2 mission years. Widespread and abundant volcanic activities recorded in the Caribbean area during the crisis period gives further credence to earlier contention that intense volcanism may have played a major role in exhacerbating pre-existing climatic conditions during that time. |
format |
Other/Unknown Material |
author |
Maurrasse, Florentin J-M. R. |
author_facet |
Maurrasse, Florentin J-M. R. |
author_sort |
Maurrasse, Florentin J-M. R. |
title |
Step-wise extinctions at the Cretaceous-Tertiary boundary and their climatic implications |
title_short |
Step-wise extinctions at the Cretaceous-Tertiary boundary and their climatic implications |
title_full |
Step-wise extinctions at the Cretaceous-Tertiary boundary and their climatic implications |
title_fullStr |
Step-wise extinctions at the Cretaceous-Tertiary boundary and their climatic implications |
title_full_unstemmed |
Step-wise extinctions at the Cretaceous-Tertiary boundary and their climatic implications |
title_sort |
step-wise extinctions at the cretaceous-tertiary boundary and their climatic implications |
publishDate |
1988 |
url |
http://hdl.handle.net/2060/19890011983 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
CASI |
op_relation |
Document ID: 19890011983 Accession ID: 89N21354 http://hdl.handle.net/2060/19890011983 |
op_rights |
No Copyright |
_version_ |
1766170177340178432 |