THE CORRELATION 83 



has been reached near Greenupsburg it has disappeared. The detailed 

 section obtained by Professor Andrews below Greenupsburg has been 

 given. * 



THE CORRELATION 



The Mauch Chunk is represented only by shales, or by shales and 

 sandstones, along the northerly border in Pennsylvania, but southward 

 limestone is found with shale above and below it. This limestone, in 

 the Allegheny Mountain region, reaches to within 30 miles of the 

 northern outcrop, while traces of it are present still farther north in the 

 anthracite region. In southern Pennsylvania it is double, with a 

 silicious division below and a more or less argillaceous division above. 

 The former is the more persistent at the north and in the central part 

 of the basin, but it is wanting in Ohio except in the extreme southeast. 

 Both divisions persist in Virginia, Tennessee, and Alabama, as well as 

 in the greater part of West Virginia and Kentucky. The lower shales 

 become indefinite southward and the upper shales extend as shales 

 little beyond the northern line of Tennessee. 



The whole series has been termed Mauch Chunk in Pennsylvania 

 and no special geographical term has been applied there to any of the 

 subdivisions except in the northwestern part of the state, where Dr 

 I. C. White gave the name Shenango to the shale which there is the 

 sole representative of the Mauch Chunk. In Maryland the upper 

 shales have been termed Mauch Chunk and the limestone Greenbrier ; 

 in Virginia Professor W. B. Rogers used the names Greenbrier shale and 

 limestone ; the United States geologists in that state have applied the 

 names Canaan and Pennington to the shales, Greenbrier and Newman 

 to the limestone ; Professor Safford in Tennessee divided the limestone 

 into Mountain limestone above and the Silicious group below, the latter 

 into the Lithostrotion and the Protean, of which the former belongs to 

 the Mauch Chunk ; to Professor Safford 's divisions Mr Hayes applies 

 the designations Bangor and Fort Payne, with, in the southeastern 

 areas, Floyd as equivalent to the lower portion of the Bangor; in 

 Alabama the limestone is divided by Smith and McCalle}^ into Bangor, 

 Hartselle, and Tuscumbia ; in Kentucky the divisions are Chester and 

 Saint Louis, and in Ohio, Andrews termed it the Maxvillle. 



The reader who has followed the details given in the preceding section 

 has seen that the Alabama divisions are traceable northward for a long 

 distance. 



*A. R. Crandall : Geol. Survey of Kentucky, Report on the geology of Greenup, Carter, and Boyd 

 counties and a part of Lawrence. Reprint of reports, vol. C, 1884, p. G 



