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Cretaceous or Tertiary

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Journal Article
Journal: Clay Minerals
Published: 01 March 2001
Clay Minerals (2001) 36 (1): 49-60.
... composed of Fe-rich smectite resulting from the diagenetic alteration of tektites and impact glasses. Minor amounts of authigenic zeolites and palygorskite also occur. This association represents a notable break in the clay mineral composition of Cretaceous and Tertiary sequences. The clay mineral...
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Journal Article
Journal: Geology
Published: 01 October 1994
Geology (1994) 22 (10): 953-958.
Journal Article
Published: 01 November 1997
Bulletin de la Société Géologique de France (1997) 168 (6): 783-793.
... to differentiate four biozones, one at the end of the Cretaceous and three at the beginning of the Tertiary. These analyses further show that 63 Upper Maastrichtian planktic foraminifers species reached the boundary where 33 species became extinct. The study also shows that some species decrease markedly...
Series: AAPG Memoir
Published: 01 January 1985
DOI: 10.1306/M39449C6
EISBN: 9781629811505
... carbonate basins to normal clastic sedimentation. The margin became inactive during the late Cretaceous to Tertiary and passive post-rift sedimentation began. Early stage and late stage of the passive wedge are the type examples used in this paper. The Eurekan megasequence of the Beaufort Sea provides...