Original publisher: Reston, Va.: U.S. Geological Survey, 2006. OCLC Number: (OCoLC)75968168 Subject: Paleontology -- Cretaceous. Excerpt: ...A little later, the ammonite Clioscaphites saxitonianus ( McLearn ) was determined to form a zone between C. vermiformis and Scaphites depressus ( Scott and Cobban, 1962 ), and the ammonite Acanthoceras? wyomingense ( Reagan ) was placed in Plesiacanthoceras ( Haas, 1964 ). The stratigraphy and paleontology of the Niobrara Formation in the Pueblo area of Colorado was investigated by Scott and Cobban ( 1964 ). Part of their table 3 is shown here. 12Original publisher: Reston, Va.: U.S. Geological Survey, 2006.
|Title||:||A Usgs Zonal Table for the Upper Cretaceous Middle Cenomanian-Maastrichtian of the Western Interior of the United States Based on Ammonites|
|Publisher||:||Books LLC - 2011-10|