378 The Upper Devonian Deposits of Maryland 



shales some of which are coarse and blocky. Smooth, thin shales also 

 occur which are slightly reddish in color and all of these rocks are shown 

 on the banks of the stream. In the grayish shales are some fossils as 

 Douvillina caijuia Hall with small pelecypods; but the fossils are not 

 common. The dip at this locality is between 13° and 14° S. E., and 

 the rocks belong in the Chemung stage of the Jennings formation. 



Dr. J. M. Clarke identified the following species from this locality : 

 Chonetes scitulus Hall, Douvillina cayuta Hall, and Sinrifer mesastrialis 

 Hall. 



Lower on the creek, not far up the liighway from the river, are quite 

 massive, very hard and compact, greenish-gray sandstones having a 

 tendency to form flagstones. On some of the layers are conspicuous ripple 

 marks which indicate shallow water during their deposition. Loose blocks 

 of conglomerate also occur at this place and there are some shaly arena- 

 ceous layers. No fossils were found in place in those sandstones ; but in a 

 loose block from about this horizon specimens of Aciinopteria were seen. 



Exposure on National Road. — In the northern part of Garrett County 

 one of the favorable localities for an examination of the Jennings and 

 Catskill formations is along the National Eoad. It is to be noted that 

 the word favorable in this connection means as far as Garrett County is 

 concerned for it may be stated that there are, in general, very few even 

 fair exposures of the Jennings formation in the county. The Catskill 

 is shown to better advantage; still, on account of the absence of fairly 

 continuous sections it becomes a matter of difficulty to give precisely the 

 stratigraphic composition and thickness of either of the formations. This 

 is particularly true of the Jennings formation and will be fully appre- 

 ciated by one who, being familiar with it in Maryland, has studied the 

 admirable exposures of the Chemung formation in southern New York, 



By the side of the road east of Mr. Michel's and west of the chapel are 

 outcrops of olive argillaceous shales with some thin mealy sandstones 

 containing a few fossils as Spirifer disjunctus Sowerby, Atrypa liystrix 

 Hall, Productella speciosa Hall, Pterinea chemungcnsis Conrad, and' 

 Murchisonia sp., while a large number of pelecypods occur in the 

 thicker layers of this exposure. These rocks alternate with red argil- 



