williamb.] STEVENSON, FRAZER, MORRIS. 99 



the second volume he adapts this nomenclature to that proposed by 

 Mr. Lesley, as where he uses Pottsville Conglomerate for " Serai," 

 Mauch Chunk Eed Shale for " Umbral," Pocouo sandstone for " Ves- 

 pertine," etc. 



Kegarding the rocks underlying thePocono sandstone, in the Fayette 

 County sectious, the author refers them to the Catskill " by direction 

 of Prof. Lesley," but under protest. 1 In a paper in the American 

 Journal of Science 2 he explained his reasons for this correlation. The 

 outcrops in question in the river gaps through Laurel and Chestnut 

 Ridges, Fayette County, are separated by many miles from other out- 

 crops of the lower series, and the stratigraphic and lithologic char- 

 acters do not furnish satisfactory means for determining the precise 

 age of the lower beds. Fossils, however, found in the rocks below the 

 characteristic Pocono sandstone were Devonian marine forms, the ma- 

 jority of them identical with species of the Chemung rocks of New 

 York, two or three Hamilton species, and no species characteristic of 

 typical Catskill rocks of New York. The author therefore concluded 

 that the rocks were of Chemung age and "probably belong to the Lower 

 Chemung." 



In the closing chapter (xxn) of the report Mr. Stevenson gives some 

 valuable " Notes on the Paleontology of Southwest Pennsylvania," giv- 

 ing a list of 55 Coal Measure fossils, 26 Lower Carboniferous, and 15 

 Devonian forms. In most of the rocks of the district the fossils are 

 rare, but occasionally in the limestones and shaly beds sufficient fossils 

 are obtained to satisfactorily determine the correlations. 



Mr. Persifor Frazer, 3 in 1877, reported that a specimen of coal was 

 given to him from a locality 18 miles east of Bath, West Virginia, and 

 later another specimen from Bath, by Mr. Pendleton. Mr. Frazer thinks 

 there are some reasons for ascribing the coal to an horizon below the 

 Carboniferous series. 



Mr. S. Fisher Morris 4 reported that the New River coal field has only 

 two seams that are workable. Their position is u in the Conglomerate, 

 No. XII, and hence they are called by Fontaine u Interconglomerate." 

 The thickness of the Conglomerate series is about 1,450 feet. 



In the report 5 on Lycoming and Sullivan counties, Messrs. Sherwood 

 and Piatt follow the established nomenclature, identifying the various 

 statafrom outcrop to outcrop mainly by stratigraphic methods. 



In the sections traced by Mr. Sherwood " provisional limits " are re- 

 corded between the Catskill red sandstone and the Pocono gray sand- 

 stone, and between the latter and " Mauch Chunk red shale." 



1 Geol. Survey of Pennsylvania, Kept, of Progress K, p. 13. 



2 3d ser., vol. 15, pp. 423-430. 



3 Frazer, jr., Persifor : Anthracite from "Third Hill Mountain," West Virginia. Phila. Acad. ScL, 

 Proc, vol. 29, 1877, pp. 16, 17, \ p. 



4 Morris, S. Fisher : "The New River coal field of West Virginia." Trans. Amer. Inst. Min. Eng., 

 vol. 8, 1879-1880, pp. 261-269. 



8 Geol. Survey of Pennsylvania, Rept. of Progress G*. Geology of Lycoming and Stillivan Coun- 

 ties. I. Field notes, by Andrew Sherwood. II. Coal Basins, by Franklin Piatt. 1880, pp. 266. 



