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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Petrography of the Volcaniclastic Woodbine Formation, Southwest Arkansas
J. K. Belk (1), E. B. Ledger (2), M. C. Crocker (3)
ABSTRACT
The Woodbine Formation (Cretaceous) of southwest Arkansas consists of conglomeratic volcaniclastic sandstones containing abundant cobbles of novaculite and other sedimentary rock fragments, as well as cobbles of trachytic, sub-silicic flow and/or shallow intrusive alkalic igneous rocks. The igneous rocks are preserved from volcanic units now completely eroded.
Most sandstones contain less than 10% quartz, but have abundant oligoclase, Ti-rich pyroxenes, and magnetite. Sandstones contain abundant smectitic clay formed by diagenesis of the volcanic material. The igneous rocks represent eruptive and hypabyssal equivalents of intrusive alkalic rocks of Cretaceous age in central Arkansas.
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