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The designation of the Bendian as a distinct period, which was proposed in 1934,(FOOTNOTE 3) was based on a line of reasoning that covered all the facts known at that time. The tremendous increase in detailed knowledge since that time now occasions the placing of the formational boundaries on a firmer basis.
The new classification differs only in some important particulars from the 1934 classification. The Bendian is now known in greater detail than heretofore. It is divided into two series--the Pushmataha beneath and the Morrow above. The important features are the subdivision of the sedimentary sequence previously known as Stanley, Jackfork, and Johns Valley. The Pushmataha is divided into seven new formational units, and the Morrow into five.
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