Maryland Geological Survey 59 



Tvpical thin, papery black shales of the Marccllus type are exposed 

 in the shale quarry about 50 feet above this fauna. The ^larcellus shale 

 here, as in most of the Alleghany sections, is largely concealed in the 

 slopes of a valley which occupies the easily eroded beds of the Marcellus 

 horizon. They appear to have a thickness of 400 feet or more at 

 Hancock. 



Erposiire at Berl-cloij Springs, West Virginia. — A good section of the 

 Onondaga member occurs about 1% miles south of Berkeley Springs, 

 W. Va.. where the wagon road cuttings expose the Oriskany sandstone and 

 the lower portion of the Romney, including most of the shales holding 

 the Onondaga fauna. The following section was noted here : 



Romney Form.\tion 



Marcellus Member ^^^^ Total. 



No. 5. Fissile blacli shale, and covered 250 333 



Onondaga Member 

 No. 4. Covered 35 83 



No. 3. Black blocky argillaceous shale, full of fossils: CJionetes 

 sp. (r), Ambocoelia umbonata (a). Nucleospira concinna (c). 

 Anoplea nucleata (c), Dalmanella lenticularis (a), Leptaenisca 

 australis n. sp. (c), Piwlidostrophia pennsylvanica n. sp. (r), 

 Nucula cf. corbuliformis (r), Cypricardinia '? sp. (r), Styliolina 

 fissurella (a), Phacops cristata (c), Cyphaspis cf. stephanophora 

 (r), Leperditia 2 cf. subrotunda (r) 20 48 



No. 2. Drab shale, weathering cherry red in places; fossils 

 scarce: Craniella hamiltoniae. Leptostrophia perplana, Ambocoelia 

 umbonata 18 28 



No. 1. Cream or light putty-colored clay shale, with some bufRsh 

 layers 10 10 



Oriskaxy Formatiox 

 Buffish-brown sandstone, crumbling to sand. 



The Marcellus in the section is imperfectly exposed and no fossils were 

 observed in it. 



Exposures of 2I(irci'llus and ilaiiiilion Members 



Kxprjsure at 21st Bridge. — The best locality at which to study the 

 Eoniney formation in its western area in Marvland is near its southern 



