The age and relationships of the McKenzie shale and limestone have presented important problems in the study of the Silurian rocks of the middle Appalachian area. As has been shown by the writer in a recent paper,1 even the later views concerning the position and character of the boundary with the underlying Rochester shale, and correlations with New York formations, are open to question. The present study summarizes results obtained by careful review of the lithology and faunas of the Rochester shale and lower part of the McKenzie shale and limestone in the classical sections at the south end of Rose Hill, near Cumberland, Maryland, and at Lakemont, between Hollidays-burg and Altoona, Pennsylvania.

The Rose Hill section was visited with Dr. Charles K. Swartz, to whom the writer is further indebted for criticisms and suggestions concerning the views expressed in this paper.

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