Most of the oil producing shales of Wyoming are confined to the Green River formation. In the southwestern part of Wyoming this formation has a maximum thickness of about 1,800 feet. A section measured by R. H. Hawn, and the writer, north of Kanda (east of the Green River station), has a total thickness of 1,785 feet.

The formation is composed predominately of light colored in part calcareous shales, interstratified with brown to black bituminous shale, gray sandstones and shaly limestones. Near the base as exposed east of the Meridan Anticline, in Uinta county, the light colored shales and sandstones...

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