In the July, 1928, number of the Bulletin, Mr. Noel Evans published an article entitled “Stratigraphy of the Weatherford Area, Oklahoma.” We believe this to be an excellent paper in which Mr. Evans clearly states his case. We agree with most of his observations, especially the importance of the post-Cloud Chief-pre-Quartermaster erosional unconformity. We believe the relief of this unconformity to be more than 140 feet. The failure by certain observers to recognize and appreciate this unconformity has caused most of the bad structural mapping of this area.

On one important point, however, we disagree with Mr. Evans. He...

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