510 



The Upper Devonian Deposits of Maryland 



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Fissile green shale and some sandstone. At top in some 

 coarse shaly sandstone occur ProcluctcJla lachrymosa var. 

 marylandica. but larger than usual, Schizophoria striatula 



smaUer than nsual, Spirifer disjunctus, Gosselletia sp 5680 58 1967 



Sandstone and shale 5520 29 1909 



Fissile green shale. Dip 20° E. In band of sandstone 



at bottom occurs Ambocwlia umbonata 5470 33 1880 



Parkhead Sandstone Member 



Fissile green shale 5390 92 1847 



Road S. 85° E. Map altitude 1000 



Green shale breaking irregularly and bands of sandstone. 5180 36 1755 

 Green fissile shale 5100 59 1719 



Road S. 75° E. Map altitude 960 



Fissile green shale. At top a bed of sandstone, perhaps 

 10 feet thick, in which are found Atrypa reticularis, 

 Camarotocchia congregata var. with deeper suggesting con- 

 tracta, Craniella hamiltonicr, Cyrtina hamiltonensis, Pro- 

 ductella lachrymosa abundant, Schizophoria impressa, 

 Spirifer (Delthyris) mesacostalis, 8. marcyi var. super stes 

 abundant, T ropidolepttis carinatus abundant, Coleolus tenui- 

 cinctus abundant, Bucanopsis nurra, Bellerophon clarki, 

 Cycl07iema concinnum, Cyclonemina multistriata abundant, 

 Straparollus marylandicus, Loxonema hamiltoni<r, L. ? 

 glabrum abundant, Ectomaria marylandica, Platyceras 

 marylandicurn common, Orthonychia unguiculata common, 

 Loxonema styliolum ?, Cypricardella tenuistriata, Gonio- 

 phora truncata common, lAopteria bigsbyi, Cypricardella 



sp. Phacops rana 4970 28 1660 



Green shale breaking irregularly. At top Spirifer (Del- 

 thyris) mesacostalis, Tropidoleptus carinatus 4910 21 1632 



Fissile green shale 4865 56.5 1611 



Green shale breaking irregularly 4745 4.5 1554.5 



Fissile green shale 4735 29 1550 



Road S. 27° W. Map altitude 920. Altitude by barometer 940 

 Shale and sandstone 4675 41.5 1521 



