Paleobiological significance of the James Ross Basin

论文摘要

The extensive Late Mesozoic–Early Cenozoic sedimentary succession exposed within the James Ross Basin,Antarctica has huge potential to enhance paleobiological investigations into both the marine and terrestrial fossil records.In excess of 7 km in total thickness and spanning the Early Cretaceous（Aptian）–Late Eocene in age,it represents an invaluable high-latitude（～65°S）site for comparison with lower latitude,tropical ones in an essentially greenhouse world.The Early Cretaceous（Aptian–Albian）sequence is deep-water but there are indications of shallowing to inner shelf depths in both the Turonian and Coniacian stages.The first prolific shallow-water marine fauna occurs in the Santonian–Campanian Santa Marta Formation and this is followed by repeated occurrences through the later Campanian,Maastrichtian,Danian and Middle Eocene（Lutetian）.In this study an attempt has been made to compare these Antarctic faunas directly with the well-known ones of the same age from the US Gulf Coast.Detailed comparisons made for three time slices,Late Maastrichtian,Danian and Middle Eocene,indicate that the Antarctic is characterised by both low taxonomic diversity and high levels of endemism.The James Ross Basin is providing important evidence to indicate that the highest southern latitudes have always been characterised by a distinctive temperate biota,even on a pre-glacial Earth.The roots of at least some elements of the modern Southern Ocean biota can be traced back to a Late Mesozoic–Early Cenozoic austral realm.

论文目录

• 1 Introduction
• 2 Geological setting
•   2.1 Gustav Group
•   2.2 Marambio Group
•   2.3 Seymour Island Group
• 3 Comparison of the JRB faunas with those of the US Gulf Coast
•   3.1 Introduction
•   3.2 Sample size bias
•   3.3 Patterns to emerge from a comparison of JRB and GC molluscan faunas
• 4 Synthesis

文章来源

类型: 期刊论文

作者: J.Alistair CRAME

来源: Advances in Polar Science 2019年03期

年度: 2019

分类: 基础科学

专业: 生物学,地质学

单位: British Antarctic Survey

基金: Financial support from the UK Natural Environment Research Council is gratefully acknowledged,and in particular: NE,I005803,1

分类号: Q911

DOI: 10.13679/j.advps.2018.0047

页码: 186-198

总页数: 13

文件大小: 517K

下载量: 4