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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 45 (1961)

Issue: 3. (March)

First Page: 330

Last Page: 341

Title: Distribution of Ordovician Graptolites in Eugeosynclinal Facies in Western North America and its Paleogeographic Implications

Author(s): Reuben James Ross, Jr. (2)

Abstract:

Graptolite-rich detrital Ordovician rocks of siliceous, argillaceous, and volcanic composition are exposed in scattered areas in westernmost North America from Convict Lake in the Sierra Nevada, through Nevada, central Idaho, British Columbia, and Yukon Territory to Alaska. The paleogeographic relation of this facies to that of carbonate rocks, rich in shelly faunas, is not everywhere clear. In Alaska large areas of Ordovician eugeosynclinal rocks may lie unrecognized.

Though graptolites are disappointing as paleoecologic indices in the eugeosynclinal strata, their presumed planktonic or epiplanktonic habit should be useful in reconstruction of former ocean currents and the lands between which they flowed.

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