Micropalaeontology and stratigraphical setting of the Cambridge Greensand
Published:April 14, 2020
Malcolm B. Hart, Lyndsey R. Fox, 2020. "Micropalaeontology and stratigraphical setting of the Cambridge Greensand", Cretaceous Climate Events and Short-Term Sea-Level Changes, M. Wagreich, M. Hart, B. Sames, I. O. Yilmaz
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The stratigraphical position of the Cambridge Greensand is confirmed as lowermost Cenomanian and the hiatus at the Albian/Cenomanian boundary described from a number of localities in SE England and East Anglia. The various sedimentary packages in the uppermost Albian and lowermost Cenomanian record a series of sea-level changes, confirmed by the changes in the foraminiferal assemblages (and other microfossils). The historical disagreements between the stratigraphical interpretations of the microfossils and macrofossils are discussed and resolved.
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Cretaceous Climate Events and Short-Term Sea-Level Changes
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Sea-level constitutes a critical planetary boundary for both geological processes and human life. Sea-level fluctuations during major greenhouse phases are still enigmatic and widely discussed in terms of changing climate systems. The geological record of the Cretaceous greenhouse period provides a deep-time view on greenhouse-phase Earth system processes that facilitates a much better understanding of the causes and consequences of global, geologically short-term, sea-level changes. In particular, Cretaceous hothouse periods can serve as a laboratory to better understand a near-future greenhouse Earth. This volume presents high-resolution sea-level records from globally distributed sedimentary archives of the Cretaceous involving a large group of scientists from the International Geoscience Programme IGCP 609. Marine to non-marine sedimentary successions were analysed for revised age constraints, the correlation of global palaeoclimate shifts and sea-level changes, tested for climate-driven cyclicities, and correlated within a high-resolution stratigraphic framework of the Geological Timescale. For hothouse periods, the hypothesis of significant global groundwater-related sea-level change, i.e. aquifer-eustasy as a major process, is reviewed and substantiated.