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  1. 1
    Collignoniceras woollgari woollgari (Mantell) ammonite fauna from Upper Cretaceous of Western Interior, United States /
    by Cobban, William A., 1916-2015
    Published 1979
    Book
  2. 2
    Aspects of ammonite biology, biogeography, and biostratigraphy /
    by Kennedy, W. J. (William James)
    Published 1976
    Book
  3. 3
    Type sections and stratigraphy of the members of the Blackleaf and Marias River Formations (Cretaceous) of the Sweetgrass arch, Montana : a report of a formal subdivision and age assignments of a classic Cretaceous area /
    Government Document Book
  4. 4
    Stratigraphy and paleontology of mid-Cretaceous rocks in Minnesota and contiguous areas /
    by Cobban, William A., 1916-2015
    Published 1983
    Government Document Book
  5. 5
    Geologic and biostratigraphic map of the Pierre Shale in the Colorado Springs-Pueblo area, Colorado /
    Published 1986
    Government Document Map
  6. 6
    Upper Cretaceous rocks and ammonite faunas of southwestern New Mexico /
    by Cobban, William A., 1916-2015
    Published 1989
    Book
  7. 7
    Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming /
    by Cobban, William A., 1916-2015
    Published 1990
    Government Document Book
  8. 8
    Middle Cretaceous stratigraphy on the south and east sides of the Uinta Basin, northeastern Utah and northwestern Colorado /
    by Molenaar, C. M.
    Published 1991
    Government Document Book
  9. 9
    Stratigraphy of the Upper Cretaceous Niobrara Formation in the Raton basin, New Mexico /
    by Scott, Glenn R., 1918-2012
    Published 1986
    Book
  10. 10
    Stratigraphy and geologic history of the Montana group and equivalent rocks, Montana, Wyoming, and North and South Dakota /
    Government Document Book
  11. 11
    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 /
    Published 2006
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    Government Document eBook
  12. 12
    Molluscan fossils and stratigraphic descriptions from the Upper Cretaceous Mancos Shale, west-central Colorado /
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    Government Document eBook
  13. 13
    Geologic and biostratigraphic map of the Pierre shale between Jarre Creek and Loveland, Colorado /
    by Scott, Glenn R., 1918-2012
    Published 1965
    Government Document Map
  14. 14
    Geologic, biostratigraphic, and structure map of the Pierre Shale between Loveland and Round Butte, Colorado /
    Published 1986
    Government Document Map
  15. 15
    Outcrops, fossils, geophysical logs, and tectonic interpretations of the upper Cretaceous Frontier Formation and contiguous strata in the Bighorn Basin, Wyoming and Montana /
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    Government Document eBook
  16. 16
    Biostratigraphic data from Upper Cretaceous formations--eastern Wyoming, central Colorado, and northeastern New Mexico /
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    Government Document Map
  17. 17
    Stratigraphy and nomenclature of some Upper Cretaceous and lower Tertiary rocks in south-central Wyoming /
    Government Document Book
  18. 18
    The Pierre shale near Kremmling, Colorado : and its correlation to the east and the west /
    Government Document Book
  19. 19
    Stratigraphy of the Niobrara formation at Pueblo, Colorado /
    Government Document Book
  20. 20
    Stratigraphy and ammonite fauna of the graneros shale and greenhorn limestone near Pueblo, Colorado /
    by Cobban, William A., 1916-2015
    Published 1972
    Government Document Book
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