MARYLAND GEOLOGICAL SURVEY 145 



Section of Martinsburg Shale and Chambersburg Limestone Northwest Corner 



of Chambersburg, Pennsylvania 

 Martinsburg shale. 



Feet 



Unfossillferous black fissile shale. 



Black shale with Corynoides fauna at base 32 



Limy shales with Cryptolithus 10 



Thin blue to black limestone holding the Sinuites fauna at the 



base 10 



Chambersburg limestone. 

 Greencastle bed. 



Massive dark bluish limestone 9 



Yellowish limy and arenaceous shale with cobbly shaly and 



sandy limestones at base 66 



Christiania bed. 



Shaly limestone with Christiania trentonensis (lower beds of 

 formation not exposed in this section but shown elsewhere 



in vicinity) 50+ 



Nidulites bed. 



Compact, massive, dark gray limestone 



Echinospherites bed. 



Argillaceous limestone weathering cobbly 



Tetradium cellulosum bed. 



Massive fine grained dark limestone 



Stones River limestone. 



South from Chambersburg along the same general line of outcrop an 

 excellent section is exposed in the railroad cut two miles southwest of 

 Marion. This is the most complete and continuous section of the forma- 

 tion known in the area east of the Martinsburg shale belt. Fossils are not 

 as abundant in some of the beds as they are elsewhere, but the lithologic 

 characters of the different divisions are well developed and the section 

 exposes all of the members recognized east of the shale belt. The Green- 

 castle member, however, is not shown in this particular section which 

 ends at the Martinsburg shale on the west, but east of the section along 

 the railroad near the pike, the Sinuites bed of lower Martinsburg shale is 

 underlain by 150 feet of dark gray massive limestone containing the 

 fauna of the Greencastle member. 



