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The biostratigraphy and paleogeography of Maastrichtian inoceramidsThe global distribution of Maastrichtian inoceramids is now known in enough detail that the patterns of disappearance can be used to place first-order constraints on paleoceanographic changes that may have occurred during that age. The Inoceramidae is an excellent group to focus on in a study of Maastrichtian events for the following reasons: (1) they were globally distributed in the early Maastrichtian; (2) they did not survive the age (i.e., they undergo change during the interval); and (3) they have left a rich microfossil and macrofossil record. Some inoceramids grew to be very large; however, even the largest often passively disaggregated and are preserved as hundreds of millions of characteristic, columnar, polygonal prisms of calcite approximately 100 microns across. This taphonomic process has greatly increased the inoceramid fossil record and provides a means of objectively estimating changes in their standing population. In addition, because these prisms commonly occur in Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) cores, it is relatively easy to generate a truly global database. The existing macrofossil record of inoceramids has less temporal and spacial resolution but greater taxonomic resolution than the microfossil record. In concert the microfossil and macrofossil records of inoceramids demonstrate that important changes occurred during the Maastrichtian. These changes are distinct from the KT boundary catastrophe but are part of the larger KT transition.
Document ID
19940023800
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Macleod, K. G. (Smithsonian Institution Washington, DC, United States)
Huber, B. T. (Smithsonian Institution Washington, DC, United States)
Ward, P. D. (Washington Univ. Seattle., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1994
Publication Information
Publication: Houston Univ., New Developments Regarding the KT Event and Other Catastrophes in Earth History
Subject Category
Geophysics
Accession Number
94N28303
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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