Record Details

Eustatic changes and the evolution of Palaeogene larger foraminifera - A numeric analysis

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Eustatic changes and the evolution of Palaeogene larger foraminifera - A numeric analysis
 
Creator SARASWATI, PK
 
Subject eocene extinctions
temperatures
palaeontology
foraminifera
evolutionary metrics
eustasy
palaeogene
 
Description Sea-level change is known to have influenced the evolution of marine life. It is examined here how faunal diversity and rates of taxic evolution are related to change in sea-level and stability of the sea-level cycles. Evolutionary metrics of Palaeogene larger foraminifera are calculated and stability of sea-level cycles are determined using number and average duration of third order cycles in each stratigraphic interval. Generic diversity and the rates of origin and extinction individually do not show one to one correspondence either with transgression-regression or with the stability of the sea-level cycles. The rate of extinction relative to the rate of origination, however, is found to be significantly affected by the stability of the sea-level cycles. The rate of extinction exceeds the rate of origin during the periods of low stability. Regression, assisted by unstable sealevel cycles and possibly sharp climatic deterioration caused extinction maxima of larger foraminifera in Late Eocene.
 
Publisher GEOLOGICAL SOC INDIA
 
Date 2011-07-30T05:03:57Z
2011-12-26T12:52:40Z
2011-12-27T05:39:21Z
2011-07-30T05:03:57Z
2011-12-26T12:52:40Z
2011-12-27T05:39:21Z
1997
 
Type Article
 
Identifier JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA, 50(1), 61-67
0016-7622
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7855
http://hdl.handle.net/10054/7855
 
Language en