Results 331 to 340 of about 201,757 (374)

The Cretaceous Period

2020
The breakup of the former Pangea supercontinent culminated in the modern drifting continents. Increased rifting caused the establishment of the Atlantic Ocean in the middle Jurassic and significant widening in Cretaceous. An explosion of calcareous nannoplankton and foraminifers in the warm seas created massive chalk deposits.
A. S. Gale, J. Mutterlose, S. Batenburg, F. M. Gradstein, F. P. Agterberg, J. G. Ogg, M. R. Petrizzo   +6 more
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Cretaceous

2018
The Cretaceous evolution of sedimentary basins in Central Europe was influenced by the interplay of two main processes: plate tectonics and eustatic sea-level change. Global plate-tectonic reconfiguration resulted in the widening of the Central Atlantic, the opening of the Bay of Biscay, and the opening of the South Atlantic Ocean causing a counter ...
Voigt, S., Wagreich, M., Surlyk, Finn, Walaszczyk, I., Ulicny, D., Cech, S., Voigt, T., Wiese, F., Wilmsen, M., Niebuhr, B., Reich, M., Funk, H., Michalik, J., Jagt, J.W.M., Felder, P.J., Schulp, A.S.   +15 more
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The Cretaceous-Tertiary Transition [PDF]

Science, 1983
The fossil sequences from cores across the Cretaceous-Tertiary boundary show a range of transition times and transition time intervals depending on the fossil indicators and the location of the site. These variations, together with the pattern of iridium distribution with depth at some sites, differences in total amounts of iridium, variations in noble
Charles B. Officer, Charles L. Drake
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Late Cretaceous and paroxysmal Cretaceous/Tertiary extinctions

Nature, 1987
The various geological signatures at Cretaceous/ Tertiary time including iridium and other associated elements, microspherules, and shock deformation features are compatible with the suggestion that the transition is marked by a period of intense volcanism.
Charles B. Officer, Anthony Hallam, Joseph D. Devine, Charles L. Drake   +3 more
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Cretaceous Dinosaur Extinction

Evolution, 1968
The reign of dinosaurs, dominant on land for about 150 million years, terminated at the close of the Cretaceous. They did not all disappear at precisely the same moment, but from a peak of about 120 genera near the middle of the period, dwindled in numbers down to the end of Cretaceous at which time a large number of genera became extinct (Newell, 1962;
Harry P. Bailey, Daniel I. Axelrod
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Response—Cretaceous Extinctions

Science, 2010
The Letters by Archibald et al. , Keller et al. , and Courtillot and Fluteau question our conclusion that the Cretaceous-Paleogene mass extinction was caused by the asteroid impact at Chicxulub.
Schulte, Peter, Alegret, Laia, Arenillas, Ignacio, A. Arz, José, J. Barton, Penny, R. Bown, Paul, J. Bralower, Timothy, L. Christeson, Gail, Claeys, Philippe, S. Cockell, Charles, S. Collins, Gareth, Deutsch, Alexander, J. Goldin, Tamara, Goto, Kazuhisa, M. Grajales-Nishimura, José, A. F. Grieve, Richard, P. S. Gulick, Sean, R. Johnson, Kirk, Kiessling, Wolfgang, Koeberl, Christian, A. Kring, David, G. Macleod, Kenneth, Matsui, Takafumi, Melosh, Jay, Montanari, Alessandro, V. Morgan, Joanna, R. Neal, Clive, D. Norris, Richard, Pierazzo, Elisabetta, Ravizza, Greg, Rebolledo-Vieyra, Mario, Uwe Reimold, Wolf, Robin, Eric, Salge, Tobias, P. Speijer, Robert, R. Sweet, Arthur, Urrutia-Fucugauchi, Jaime, Vajda, Vivi, T. Whalen, Michael, S. Willumsen, Pi   +39 more
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Jamaican Cretaceous Crinoidea

Journal of Paleontology, 1993
Jamaica has the best-known fauna of fossil crinoids of the Antillean islands. Two Cretaceous species have been reexamined on the basis of new material. Lower Cretaceous Apiocrinites sp., previously referred to Austinocrinus n. sp. and first documented from a short pluricolumnal, is now known from brachials and further fragments of column.
Cornelis J. Veltkamp, Stephen K. Donovan, Clare V. Milsom   +2 more
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The Cretaceous Tethys

1995
Cretaceous transgressions left marine deposits over wide areas of Tethys, from which it is possible to develop paleogeographic maps depicting the configuration and extent of marine and continental paleoenvironments, including oceanic seafloor and structural patterns.
Gilbert Camoin, Jean-Pierre Masse, Jean Philip   +2 more
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Bornaviruses from the Cretaceous

Nature Reviews Microbiology, 2021
Analysis of endogenous viral elements reveals that bornaviruses already infected hosts 100 million years ago.
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