› › Problem Of The Cretaceous Tertiary Boundary In New Jersey


Cretaceous-Tertiary Boundary in New Jersey, Delaware, and Eastern Maryland

Author : James P. Minard

Publisher :

Page : 44 pages

File Size : 11,9 MB

Release : 1969

Category : Delaware

ISBN :

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Book Description

The basal Tertiary Hornerstown Sand unconformably overlaps progressively lower truncated beds in the underlying Cretaceous section southwestward through New Jersey, Delaware, and eastern Maryland.





The Bug Creek Problem and the Cretaceous-Tertiary Transition at McGuire Creek, Montana

Author : Donald L. Lofgren

Publisher : Univ of California Press

Page : 204 pages

File Size : 24,3 MB

Release : 1995-08-31

Category : Science

ISBN : 9780520915794

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Book Description

Bug Creek assemblages from Montana, transitional in composition between typical Cretaceous and Paleocene vertebrate faunas, are critical to K-T extinction debates because they have been used to support both gradual and catastrophic K-T extinction scenarios. Geological and palynological data from McGuire Creek indicate that Bug Creek assemblages are Paleocene and restricted to channel fills entrenched into older sediments, suggesting that the Cretaceous component of the assemblage was reworked. Thus, the author concludes, "Paleocene dinosaurs" are an illusion and the K-T survival rate of mammals is low because the presence of Cretaceous mammals in Bug Creek assemblages is also the result of reworking.