Maryland Geological Survey 51 



(its first appearance in the Devonian in the Maryland reports), Oriskany, 

 Komney, Jennings and Hampshire formations, the detailed description 

 of which is given on pp. 94-109. The nomenclature and classification of 

 the formations are those adopted by Messrs. Clark, Prosser, and Rowe for 

 the Maryland formations. The accompanying map gives the areal distri- 

 bution of the formations described in the county, while the legend gives 

 their thickness together with a very condensed account of the geology and 

 soils of the county. 



During the same year Bailey A\'illis published his paper on " Paleo- 

 zoic Appalachia or the Histor}' of Maryland during Paleozoic time " in 

 which land and water areas are discussed and illustrated by maps. Under 

 the Devonian its early shallow waters and lowlands and the later high- 

 lands are described. This includes a description of the wide extent of the 

 Devonian lowland, the character and thickness of the deposits, the topog- 

 raphy of the highlands and the character of the Devonian deformation. 



In 1901 the writer published an article on " The Palezoic formations of 

 Allegany County, Maryland." The different formations of the county, 

 ranging from the Juniata of the Ordovician to the Dunkard of the Permian 

 are described and correlated Avith the formations of New York and 

 Pennsylvania, as far as they are represented in those states. The Coey- 

 mans, New Scotland, and Becraft formations of the Helderberg series 

 of New York are identified and described for the first time in Maryland. 

 The Eomney formation is described as composed of the Marcellus shale 

 and Hamilton beds of New York, the Jennings formation as composed 

 of the Portage and Chemung of New York and the Hampshire as rep- 

 resenting at least part of the Catskill formation of New York. The 

 Helderberg limestone, Oriskany sandstone, Eomney, Jennings, and 

 Hampshire formations are referred to the Devonian System. 



In 1902 Dr. George C. Martin published an account of the geology of 

 Garrett County in which he fully discussed its stratigraphy, structure and 

 the interpretation of its sedimentary record, and gave the areal extent, 

 lithologic description and taxonomy of its various formations. Only two 

 of the Devonian formations, the Jennings and Catskill, are exposed in 

 the county, and these are described on pp. 85-90. The Atlas contains a 



