English: Exposure near Marshall, Arkansas of interfingering contact between the dark gray Fayetteville Shale and the overlying, buff
colored Pitkin Limestone, both of Mississippian age. Elsewhere in the Arkoma Basin, the Fayetteville Shale is both the source and reservoir for a
large continuous gas accumulation and the Pitkin Limestone locally is a reservoir for conventional gas accumulations. Photograph by Stanley T. Paxton, U.S. Geological Survey.
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Uploaded a work by Photograph by David W. Houseknecht, U.S. Geological Survey Photograph by Stanley T. Paxton, U.S. Geological Survey. from https://pubs.usgs.gov/fs/2010/3043/pdf/FS10-3043.pdf with UploadWizard