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The AAPG/Datapages Combined Publications Database
Ardmore Geological Society
Abstract
Petrography of Paleozoic Sandstones from the Ouachita Mountains of Oklahoma and Arkansas
ABSTRACT
Sandstones of the Lukfata, Crystal Mountain, Blakely, Missouri Mountain, and Hot Springs formations consist largely of quartz and chert with only small amounts of feldspars, composite (rock) grains, and interstitial detrital argillaceous material. These sandstones are classified as quartzose sandstones or orthoquartzites. Sandstones of the Stanley formation, sandstones of the Womble formation in McCurtain County, and thin sandstone interbeds in the Arkansas novaculite contain moderate amounts of feldspars and rock grains and have an interstitial primary mud matrix; these rocks are classified as lithic graywackes. Sandstones of the Blaylock, Jackfork, and Atoka formations contain small to moderate amounts of feldspar, rock grains, and interstitial "clay"; these rocks are classified as quartzose subgraywackes or "protoquartzites".
Theoretical considerations based on sandstone types, concealed sediment thicknesses, position of major unconformities, and faunal studies suggest a double Paleozoic geosynclinical cycle in the Ouachita Mountain region, with periods of maximum geosynclinal downwarping in the Ordovician and Mississippian.
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