Abstract

Introduction

At the 1923 Washington meeting of the Geological Society of America, Prof. Charles H. Behre read a paper entitled “Structures in the slates of northeastern Pennsylvania,” of which an abstract was published in the Bulletin of the Society for 1924. The gist of this, paper is that the formations about Slatington and Lehigh Gap have twice undergone orogeny, and that “the earlier (Taconic) movement produced slaty cleavage, close folding with great overturns and thrust-faults, and minor faults transverse to the axes of the folds.”

Professor Behre wishes to have it understood that he is not the discoverer of the unconformity at Lehigh Gap. In a letter to the writer, he says:

“Professor B. L. Miller, Dr. Hintze, and, I believe, Doctor Edgar T. Wherry, all saw the unconformity before I did. It is mentioned in some of Grabau’s works, and I. C. White calls attention to it in at . . .

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