Pedogenic development at the Cretaceous-Tertiary boundary, Garfield County, Montana

D. E. Fastovsky, Kevin McSweeney, L. D. Norton

Research output: Contribution to journalArticlepeer-review


The fabric, mineralogy, and geochemistry of a 0.5-1.5 cm-thick claystone parting indicate that certain of its features are the result of contemporaneous pedogenesis, a diastem (i.e., micro-disconformity) between the 2:1 and 1:1 claystone layers. The temporal separation between these two layers, indicated by the contrast in the nature and arrangement of pedogenic features as well as by the textural, mineralogical, and geochemical distinctness of the two layers, militates against the two layers of the parting resulting from the same event. In this respect, our conclusions differ from those of previous workers. -from Authors

Original languageEnglish (US)
Pages (from-to)758-767
Number of pages10
JournalJournal of Sedimentary Petrology
Issue number5
StatePublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)


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