500 The Upper Devoniax Deposits of Maryland 



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Green fissile shale and beds of concretionary sandstone, 



some of the latter two feet thick. Dip 50° E 2948 46.5 2069 



Green fissile shale and beds of flaggy sandstone. Dip 

 47° E. In a flaggy sandstone at the top occur Ambocwlia 

 umhonata abundant, Chonetes scitulus common, Cyrtina 

 hamiltonensis rare, Liopteria marylandica, Schizodits trig- 

 onalis 2883 86.6 2023 



Parkhead Sandstone Member 



Concealed 2754 73.6 1936 



Concealed. On the strike from the top of this unit were 

 found Camarotwchia congregata var. parkheadensis abun- 

 dant, Productella laehrymosa, Spirifer marcyi var. super- 



stes. S. (DeWhyris) viesacostalis abundant, Tropidoleptus k 



carinatus abundant, Cyclonemina muUistriata common, • 



cf. Holopea 7-oivei, Plexirotomaria (Oyroma) capillaria. 

 Goniophoria hamiltonensis. About 20 feet horizontally and 

 11.7 feet vertically below the last-named horizon, in shaly 

 sandstone were found Bucanopsis mwra, Bellerphon clarki 

 abundant, Orthoceras cf. demum, Palaoneilo plana, Cypri- 

 cardella gregaria var 2554 184 1863 



Ravine 2304 



Concealed. On the strike from the beginning of this 

 unit was found in greenish-gray sandstone Camarotweliia 

 sp. North of the top of this unit where the ravine branches, 

 in a hard gritty sandstone, were found CamaroUrchia 

 congregata var. parkheadensis abundant, Tropidoleptus 

 carinatus, Coleolus tenuicinctus, Bellerphon clarki abun- 

 dant, cf. Liopteria sp., Palwoneilo plana, Cypricardella gre- 

 garia var., Ooniophoria hamiltonensis 2304 73.6 1679 



Concealed on the Western Maryland Railroad. On the 

 side of the hill above the railroad the base of this interval 

 is seen to be made largely of fissile olive-green shale, above 

 which a great deal of hackly shale juts out on the hillside; 

 190 feet east (vertical distance 139.8 feet) from the base 

 of this unit, a ledge of hard sandstone is seen on the hill, 

 probably ten feet thick. At the top occur Camarotwchia 

 congregata var. parkheadensis abundant, Tropidoleptus 

 carinatus, Grammysia elliptica, Cypricardella tenuistriaia 2204 478.5 1605 



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