Book contents
- Frontmatter
- Contents
- List of contributors
- Preface
- 1 Introduction
- 2 The Cretaceous world
- 3 The Cenozoic world
- 4 Calcareous nannoplankton and global climate change
- 5 Phenotypic response of foraminifera to episodes of global environmental change
- 6 The response of planktonic foraminifera to the Late Pliocene intensification of Northern Hemisphere glaciation
- 7 The response of Cretaceous cephalopods to global change
- 8 Global change and the fossil fish record: the relevance of systematics
- 9 Response of shallow water foraminiferal palaeocommunities to global and regional environmental change
- 10 Intrinsic and extrinsic controls on the diversification of the Bivalvia
- 11 Global events and biotic interaction as controls on the evolution of gastropods
- 12 Algal symbiosis, and the collapse and recovery of reef communities: Lazarus corals across the K–T boundary
- 13 Changes in the diversity, taxic composition and life-history patterns of echinoids over the past 145 million years
- 14 Origin of the modern bryozoan fauna
- 15 Angiosperm diversification and Cretaceous environmental change
- 16 Cenozoic evolution of modern plant communities and vegetation
- 17 Leaf physiognomy and climate change
- 18 Biotic response to Late Quaternary global change – the pollen record: a case study from the Upper Thames Valley, England
- 19 The Cretaceous and Cenozoic record of insects (Hexapoda) with regard to global change
- 20 The palaeoclimatological significance of Late Cenozoic Coleoptera: familiar species in very unfamiliar circumstances
- 21 Amphibians, reptiles and birds: a biogeographical review
- 22 Paleogene mammals: crises and ecological change
- 23 Response of Old World terrestrial vertebrate biotas to Neogene climate change
- 24 Mammalian response to global change in the later Quaternary of the British Isles
- 25 Human evolution: how an African primate became global
- 26 The biotic response to global change: a summary
- References
- Index
2 - The Cretaceous world
Published online by Cambridge University Press: 14 August 2009
- Frontmatter
- Contents
- List of contributors
- Preface
- 1 Introduction
- 2 The Cretaceous world
- 3 The Cenozoic world
- 4 Calcareous nannoplankton and global climate change
- 5 Phenotypic response of foraminifera to episodes of global environmental change
- 6 The response of planktonic foraminifera to the Late Pliocene intensification of Northern Hemisphere glaciation
- 7 The response of Cretaceous cephalopods to global change
- 8 Global change and the fossil fish record: the relevance of systematics
- 9 Response of shallow water foraminiferal palaeocommunities to global and regional environmental change
- 10 Intrinsic and extrinsic controls on the diversification of the Bivalvia
- 11 Global events and biotic interaction as controls on the evolution of gastropods
- 12 Algal symbiosis, and the collapse and recovery of reef communities: Lazarus corals across the K–T boundary
- 13 Changes in the diversity, taxic composition and life-history patterns of echinoids over the past 145 million years
- 14 Origin of the modern bryozoan fauna
- 15 Angiosperm diversification and Cretaceous environmental change
- 16 Cenozoic evolution of modern plant communities and vegetation
- 17 Leaf physiognomy and climate change
- 18 Biotic response to Late Quaternary global change – the pollen record: a case study from the Upper Thames Valley, England
- 19 The Cretaceous and Cenozoic record of insects (Hexapoda) with regard to global change
- 20 The palaeoclimatological significance of Late Cenozoic Coleoptera: familiar species in very unfamiliar circumstances
- 21 Amphibians, reptiles and birds: a biogeographical review
- 22 Paleogene mammals: crises and ecological change
- 23 Response of Old World terrestrial vertebrate biotas to Neogene climate change
- 24 Mammalian response to global change in the later Quaternary of the British Isles
- 25 Human evolution: how an African primate became global
- 26 The biotic response to global change: a summary
- References
- Index
Summary
INTRODUCTION
The Cretaceous Period extended from 145 Ma to 65 Ma ago, and is believed to have differed from our present world in several major respects. First, the period has been characterized as a time of globally warm ‘greenhouse’ conditions, in which there were no polar ice caps. Although this is generally correct, there is evidence for considerable climatic change in both temperature and patterns of humidity. Secondly, Cretaceous deep ocean water was warm and saline and derived from low latitude areas of high evaporation, in contrast to the cold polar water which occupies the deep oceans at present. Thirdly, eustatic sea levels were very high, particularly during the Late Cretaceous, and the interiors of the major continents were covered with shallow seas.
Scientists have only recently provided good explanations for these differences. Although detailed interpretations vary, there is general agreement that high levels of atmospheric carbon dioxide (a well-known greenhouse gas), perhaps eight to ten times those at present, were responsible for elevated temperatures in the Cretaceous. The resulting climates were equable, with moderately high polar temperatures and a low pole to equator temperature gradient. As a consequence, high latitude sea water was neither sufficiently cold nor saline to sink and form bottom water. The source of high carbon dioxide levels has been attributed to outgassing during periods of exceptionally fast ocean floor spreading.
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- Biotic Response to Global ChangeThe Last 145 Million Years, pp. 4 - 19Publisher: Cambridge University PressPrint publication year: 2000
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