Low-latitude sea-surface temperatures for the the mid-Cretaceous and the evolution of planktic foraminifera: comment and reply
Article Abstract:
An isotopic research conducted by R.D. Norris and P.A. Wilson showed evidence for low-altitude sea-surface temperatures and the depth stratification and evolution of mid-Cretaceous planktonic foraminifera from Ocean Drilling Program hole 1052E, Blake Plateau, North Atlantic. Based on this research, the authors argued that the foraminiferal species Planomalina, Ticinella and Biticinella lived closer to the sea surface. If these assertions are correct, they should be addressed, particularly with regard to the reconstruction and implications of depth stratification of mid-Cretaceous foraminifera.
Publication Name: Geology
Subject: Earth sciences
ISSN: 0091-7613
Year: 1999
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Middle-late Cretaceous climate of the southern high latitudes: stable isotopic evidence for minimal equator-to-pole thermal gradients: discussion and reply
Article Abstract:
A 1995 study presented evidence of reduced equator-to-pole temperature gradients during the Cretaceous period. In particular, minimal latitudinal thermal gradients were described for the Albian, Coniacian-Santonian and late Maastrichtian. However, the study should not have ignored oceanographic temperature data from high latitudes when computing for the gradients. Moreover, in the absence of trace element data, the isotopic data from planktonic foraminifera from the high-latitude sites should not have been relied on when desribing the gradients.
Publication Name: The Geological Society of America Bulletin
Subject: Earth sciences
ISSN: 0016-7606
Year: 1996
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Middle-late Cretaceous climate of the southern high latitudes: stable isotopic evidence for minimal equator-to-pole thermal gradients: discussion and reply
Article Abstract:
A 1995 study has been criticized for relying on warm paleotemperatures derived from austral, high-latitude planktic foraminifera to describe minimal equator-to-pole thermal gradients in the southern high latitudes during the Cretaceous period. Moreover, the study was also attacked for ignoring the impact of oceanographic temperature data from high latitudes on the gradients. However, closer study reveals that there are no bases for these criticisms.
Publication Name: The Geological Society of America Bulletin
Subject: Earth sciences
ISSN: 0016-7606
Year: 1996
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