The paper, “ ‘Park City’ Beds on Southwest Flank of Uinta Mountains, Utah,” by J. Stewart Williams, in the January, 1939, number of the Bulletin,2 has given an understanding of the stratigraphy of the Permian Phosphoria formation in an area about which there has not been adequate information and, in addition, has cleared up many points regarding the enigmatic Park City formation.

The nomenclatural system used by Dr. Williams is, however, subject to criticism. He applies the name Mackentire “red-beds” tongue of the Phosphoria formation to a “westwardly thinning tongue of the ‘red beds” “3 and says that...

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