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Thierstein, H.R. (1982). gTerminal Cretaceous plankton extinctions: A critical assessment.h. Geol. Soc. Am. Special Paper 190: 385-399. 
Sheehan, P.M.; Fastovsky,D.E. (1992). gMajor extinctions of land-dwelling vertebrates at the Cretaceous-Tertiary boundary, eastern Montana.h. Geology 20: 556-560. 
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Littler, Kate; Robinson, Stuart A., Bown, Paul R., Nederbragt, Alexandra J., Pancost, Richard D. (2011). gHigh sea-surface temperatures during the Early Cretaceous Epochh. nature geoscience 4 (3): 169-172. doi:10.1038/NGEO1081. 
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