Maryland Geological Survey 75 



Exposures of Southern Allegany County. — The belt of Romney, ju?t 

 described at Gilpin, when followed more than one-half the distance across 

 the county to the soi;th, becomes broader and because of repetition by fold- 

 ing, the formation extends for 8 miles along its southern border. There 

 are various exposures, still in most of them the rocks are badly weathered 

 and the folding has made it well nigh impossible to form any satisfactory 

 estimate regarding their thickness. Outcrops were studied at a number 

 of localities, the most important of which will be somewhat briefly 

 described. 



In the eastern part of the area in Town Creek Valley north of Strat- 

 ford Ridge are exposures of coarso arenaceous shales by the side of the 

 highway directly north of Mr. George Diefenbaugh's house. The shales 

 are bluish and contain a good manv fossils among which are such charac- 

 tertistic Hamilton species as Spirifer mucronatus (Conrad), Tropido- 

 leptus carinatus (Conrad), Pterinea flabeUum (Conrad), and other 

 species. The complete list is as follows : Stropheodonta (Leptostrophia) 

 perplana (Conrad), Chonetes mucronatus Hall, Chonetes lepidus (?) 

 Hall, Tropidolcptus carinatus (Conrad), Spirifer mucronatus (Conrad), 

 Spirifer granulosus (Conrad), Amhococlia umbonata (Conrad), Palaeo- 

 neilo sp., Pterinea fiahellum (Conrad), Actinopteria cf. boydi (Conrad),' 

 Pleurotomaria (Bembexia) sulcomarginata Conrad. 



It will be seen that the fauna is a Hamilton one and the lithologic 

 appearance of the shales is like that of numerous outcrops of arenaceous 

 Hamilton shales in New York. 



Somewhat farther south by the side of the same road and south of 

 Mr. Rufus Diefenbaugh's house are fine, black, argillaceous shales becom- 

 ing brownish to chocolate colored on weathering. They contain good 

 specimens of Styliolina fissureUa (Hall) and lAorhynchus limitare 

 (Vanuxem) though most of the latter specimens are very much crushed 

 and the markings are nearly obliterated. These shales are fully as fissile 

 and black as any of the Marcellus shales in New York in which stage 

 they belong. 



^ Although Hall mentions rarely finer Intercalated rays for this species and 

 none are shown in the figures, there is in the above specimen a finer ray 

 hetweftn the two coarser ones which are cancellated by concentric lines. 



