Correlation Using a Bentonite Layer In The Cretaceous Austin Formation In Dallas County, Texas

Authors

Eugene Herrin, Southern Methodist University
Herbert Robertson

Abstract

Correlation is established on stratigraphic evidence in the Cretaceous lower Austin formation across Dallas County, Texas, using a particular bentonite bed approximately 8 inches thick. This bed is composed largely of the clay mineral, montmorillonite, along with subordinate amounts of illite and quartz. Montmorillonite occurs in adjacent calcareous beds, in place of illite, the more common clay mineral in the Austin formation. Therefore, an increase in montmorillonite content should indicate proximity to a bentonite bed. It is suggested that time-rock units may be established based on bentonite beds or upon intervals of high montmorillonite content in the limestone strata.

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Recommended Citation

Herrin, Eugene and Robertson, Herbert (1961) "Correlation Using a Bentonite Layer In The Cretaceous Austin Formation In Dallas County, Texas," Journal of the Graduate Research Center: Vol. 29: No. 1, Article 4.
Available at: https://scholar.smu.edu/journal_grc/vol29/iss1/4