During recent field work in Kansas, many channel sandstones were discovered in the upper Pennsylvanian and lower Permian rocks. The new channels originated in the Willard, Pierson Point, Langdon, Pony Creek, West Branch, and Hamlin shales and the Caneyville limestone. Some of them are as much as 110 feet deep.

Most of the channels are filled with non-marine sediments, though a few are partly filled with marine sediments. The sediments were probably derived from the north and northwest. The channels are deepest and most extensive in the youngest Pennsylvanian sedimentary rocks, but no channel can be selected as the unconformity between the Pennsylvanian and Permian.

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