Molluscan biostratigraphy of the Cretaceous Western Interior Basin, North America

E. G. Kauffman, B. B. Sageman, J. I. Kirkland, W. P. Elder, P. J. Harries, T. Villamil

Research output: Contribution to journalArticlepeer-review

166 Scopus citations


The evolution of biostratigraphic systems in Cretaceous sequences of the Western Interior Basin has been rapid. Broad assemblage zones of early workers have been progressively replaced by more refined zonal systems based first on single lineages of ammonites or inoceramid bivalves, next on simple assemblage and concurrent range zones blending these two groups, and ultimately on composite assemblage zones utilizing diverse molluscan groups with high biostratigraphic potential. The current version of this latest and most refined system is presented. This biozonation utilizes numerous ammonite lineages, inoceramid, ostreid, lucinid, thyasirid, pectinid, plicatulid, cardiid, and pteriid bivalve lineages, and turritellid and aporrhaid gastropod lineages to create a system of 89 high-confidence level (HCL), 136 medium-confidence level (MCL), and 169 low confidence level (LCL) composite assemblage biozones for the Cretaceous Western Interior Basin of North America. The resultant chronology for the Western Interior Cretaceous allows correlation basinwide at levels of resolution greater than 100 000 years and services as the North American standard for the Global Sedimentary Geology Program. -from Authors

Original languageEnglish (US)
Pages (from-to)397-434
Number of pages38
JournalGeological Association of Canada Special Paper
StatePublished - Jan 1 1993

ASJC Scopus subject areas

  • Fuel Technology
  • Geology
  • Geochemistry and Petrology

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