In discussing the Embar and related formations of Wyoming in his article, “Character of Producing Sandstones and Limestones of Wyoming and Montana,” in this Bulletin, Vol. 16, No. 9 (September, 1932), Bartram has postulated an unconformity occurring within the Phosphoria formation (pp. 870-73). He “believes that the Phosphoria,…, should be divided and the unconformity recognized.”

Although the writer does not question the possibility of a mid-Phosphoria unconformity, for there remain many unexplained points regarding the formation, he believes that at present there is not sufficient evidence at hand to justify the recognition of an unconformity at this horizon, or...

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