T8 The Middle Devonian Deposits of Maryland 



Tonoloway Eidge which crosses the western part of Hancock township 

 from Pennsylvania to the Potomac River in a direction about parallel 

 with that of the ridge. The belt of lower country between Tonoloway 

 Eidge and Sideling Hill is composed mainly of rocks belonging in the 

 Romney, Jennings, and Catskill formations. 



No. 1. The first exposure of Eomney shale in following the National 

 Road west from Hancock occurs after crossing Tonoloway Ridge, about 

 3 miles west of the village. The outcrops of clearly argillaceous, sparingly 

 fossiliferous shales, buff to olive in color especially by the roadside, 

 weather to a decidedly buff color and are often stained with reddish 

 spots or streaks ; while at certain places they vary from very light gray to 

 an almost whitish color. This exposure which belongs in the lower, fine, 

 nearly unfossiliferous shales of the Hamilton, occurs by the bam where 

 the road turns south. A little farther west is a second outcrop by the 

 house in which the shales have about the same lithologic appearance. No 

 fossils were found and on weathering these shales are decidedly buff in 

 color and the edges of the breaks are clearly stained red from the iron 

 which they contain. 



No. 2. On top of the knoll to the west are olive, very argillaceous 

 shales which when weathered have a decidedly buff to reddish color. Some 

 of them have concentric reddish layers, the tint probably due to weather- 

 ing and the presence of iron. Spirifcr mucronatus (Conrad) was found. 

 No. 3. A little farther west on the road, about one-quarter mile west 

 of Tonoloway Ridge, are somewhat arenaceous, gray to bluish-gray blocky 

 shales which break into more rectangular pieces and contain numerous 

 specimens of Spirifer mucronatus (Conrad) though with this exception 

 fossils are not common. The following species were obtained : Chonetes 

 coronatus (Conrad), Tropidoleptus carinatus (Conrad), Palaeoneilo muta 

 Hall ( ?), Tentaculites attenuatus Hall. 



On the National Road about one-half mile west of Tonoloway Eidge 

 the following species were found : SchucherteUa sp., Chonetes coronatus 

 (Conrad), Chonetes scitulus Hall, Chonetes setiger (Hall), Chonetes 

 lepid%is Hall, Tropidoleptus carinatus (Conrad), Spirifer mucronatus 

 (Conrad), Nucula hellistriata (Conrad), Nuculites oblongatus Conrad, 



