Full Title: The Ordovician Deicke and Millbrig K-Bentonite Beds of the Cincinnati Arch and Southern Valley and Ridge Province
Author: John T. Haynes
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The author presents findings of an investigation of the petrology, diagenetic history, and stratigraphy of the Ordovician Deicke and Millbrig K-bentonite beds in the southeastern United States. These two K-bentonites are altered volcanic ash, representing the airfall deposits of two of the largest single-vent volcanic eruptions in the Phanerozoic rock record. A description of the primary and authigenic minerals is followed by interpretation of the origin and diagenetic history of both beds. Because of their persistence across several facies changes in the southern Appalachians, the Deicke and Millbrig are ideal for observing the effects of varying burial conditions on a compositionally uniform stratum. This lateral persistence makes them ideal marker beds for stratigraphic purposes as well, and the latter part of the text is devoted to a discussion of the regional litho- and biostratigraphic significance of these two beds.
Published: 5/26/1994
ISBN Number: 081372290X
Pages: 80
Product Category: Special Papers