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The unique original structures of the Permian Lyons sandstone of the Front Range of Colorado are described in detail. A chart, two line diagrams and several photographs set forth the salient aspects of the formation; hence, the paper is primarily a study in sedimentation. Certain original structures in the Lyons such as cross-stratification, lamination, and rhomboid ripple mark are compared with similar features of modern beaches. These facts and inferences combined with the stratigraphic relationships of the Lyons lead to the conclusion that the Lyons sandstone is an ancient littoral deposit in which both shore and eolian processes are discerned.
A secondary conclusion is that the Lyons is Middle Permian in age, approximately equivalent to the Leonard formation of West Texas.
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