A USGS Zonal Table for the Upper Cretaceous Middle Cenomanian--Maastrichtian of the Western Interior of the United States Based on Ammonites, Inoceramids, and Radiometric Ages
Open-File Report
2006-1250
By: William A. Cobban, Ireneusz Walaszczyk, John D. Obradovich, and Kevin C. McKinney
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Abstract
From the Introduction:
This provisional table is based mainly on the molluscan fossil record of the central and northern parts of the Western Interior of the United States. Some of the ammonite zones are known in Europe, such as Watinoceras devonense, Collignoniceras woollgari, Prionocyclus germari, Scaphites hippocrepis, Didymoceras stevensoni, and Didymoceras cheyennense, whereas more than one-half of the inoceramid zones are known also in Europe. A few of the ammonite zones are known from only a few localities, but the diagnostic species may occur in abundance. Among these are the zones of Acanthoceras granerosense, A. bellense, Dunveganoceras problematicum, Burroceras clydense, Watinoceras devonense, Collignoniceras praecox, and Scaphites mariasensis. All fossils listed in the table are in the national collection housed in Building 810 at the Federal Center, Denver, Colorado
Suggested Citation
Cobban, W., Walaszczyk, I., Obradovich, J.D., McKinney, K.C., 2006, A USGS Zonal Table for the Upper Cretaceous Middle Cenomanian--Maastrichtian of the Western Interior of the United States Based on Ammonites, Inoceramids, and Radiometric Ages (Version 1.0): U.S. Geological Survey Open-File Report 2006-1250, ii, 45 p., https://doi.org/10.3133/ofr20061250.
ISSN: 2331-1258 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | A USGS Zonal Table for the Upper Cretaceous Middle Cenomanian--Maastrichtian of the Western Interior of the United States Based on Ammonites, Inoceramids, and Radiometric Ages |
| Series title | Open-File Report |
| Series number | 2006-1250 |
| DOI | 10.3133/ofr20061250 |
| Edition | Version 1.0 |
| Year Published | 2006 |
| Language | ENGLISH |
| Description | ii, 45 p. |
| Online Only (Y/N) | Y |