Maryland Geological Survey 49 



Professor G. H. Williams in 1891 described briefly the formatious in 

 the vicinity of Hancock and Cumberland, illustrated by figures the geo- 

 logical structure and used the Xew York names for the formations. The 

 same number of the Johns Hopkins University circulars contained a pre- 

 liminary catalogue of the Paleozoic fossils of Maryland by Charles R. 

 Keyes, and a large majority of the species are credited to the Lower 

 Helderberg, Oriskany, and Hamilton formations. 



Mr. Darton published in 1892 " Notes on the Stratigraphy of a portion 

 of Central Appalachian Virginia " in which new names are proposed for 

 many of the Paleozoic formations of the Virginias. This paper contained 

 the first description of the Monterey sandstone, the Romney shales and the 

 Jennings and Hampshire formations. 



The geological portion of the World's Fair Book on Maryland written 

 by Professors G. H. Williams and W. B. Clark and published in 1893, 

 contains a description of the Devonian geology of the Appalachians proper 

 and the Alleghany Plateau (pp. 46-49) in which in general the New York 

 names are used for the Maryland Paleozoic formations, although in the 

 legend of the geological map, which was edited by Prof. Williams, the 

 names of the New York fonnations are followed in parenthesis by the 

 equivalent ones proposed by Mr. Darton. Four divisions of the Devonian 

 are represented on the map. These are the Helderberg (Lewistown) 

 limestone; Oriskany (Monterey) sandstone; Chemung-Hamilton (Jen- 

 nings-Romney) slates and shales, and the Catskill (Hampshire) red 

 sandstone. The map also gives a structural section from east to west 

 across the State. 



Mr. Darton stated in his paper of 1892 that the names proposed for the 

 Paleozoic fonnations had been selected for the geological maps of Appa- 

 lachian Virginia to be published by the U. S. Geological Survey. The 

 Piedmont folio was published in 1896. It covers the southern part of 

 Garrett County in which the Jennings and Hampshire formations of tliat 

 area are mapped and described, and the southwestern corner of Allegany 

 County. The following formations, now referred to the Devonian, are 

 represented on the map and classified as Lewistown limestone and chert- 

 lentil forming the upper part of the Silurian, jMonterey sandstone given 

 4 



