156 The Lower Devonian Deposits of Maryland 



along the foot of the stone wall, north of the German Catholic Church. 

 This is the section from which collections were made by Hall and Andrews. 

 The fossils were described by Hall as Lower Helderberg forms, in Volume 

 iii of the Palaeontology of New York, 1859. Unfortunately, this section 

 has been almost completely concealed by its use at one time as a. dumping 

 ground for the rubbish of Cumberland. The section begins at the 

 Stromatopora reef east of the bridge and extends westward. 



Helderberg Formation 



Horizontal Vertical Total 

 TTeiitier MevyiTier distance thickness vertical 



iLeyser Memoer j^^^ j^^^ thickness 



Concealed. 



100 feet east of the Market Street Bridge occurs 

 a thick Stromatopora bed 450.0 .... 



Concealed 350.0 



Bridge 350.0 



Concealed. 



At base of interval argillaceous blue-gray limestone, 

 becoming gray upon weathering, 1.5 thick. Contains 

 Fenestclla (Cycloporina) altidorsafa. Orthopora rhom- 

 tifera, Dalmanella sp., Rhynchospira formosa (c), 

 Atrypa reticularis (c). This exposure is to be seen in 

 the road running parallel to the railroad 350.0 



Concealed 180.0 



Remaining exposures of this section are seen along 

 the bluff south of the railroad. Dark blue lime- 

 stone appearing heavy-bedded and nodular, weath- 

 ering to gray. Gypidula coeymanensis var. prognostica 

 near the top. At the bottom occur Fistuliporella mary- 

 landica, Orthopora rhombifera, Spirifer modestus (a) 

 S. octocostatus, Chonetes jerseyensis. Schuchertella 

 marylandica, Stropheodonta geniculata (r), Atrypa re- 

 ticularis (c), Merista typa (r), Meristella sp. and 

 crinoids 160.0 6.6 56.7 



Concealed 150.0 23.2 50.1 



Blue-gray, heavy-bedded limestones 80.0 8.3 26.9 



Concealed 55.0 9.6 18.6 



Shaly gray limestone. Atrypa reticularis (r) and 

 crinoids 26.0 1.0 9.0 



Concealed 25.0 7.9 8.0 



Shaly gray nodular limestone. CamarotoccJiia la- 

 mellata (a) 1.0 1.0 1.0 



Concealed. 



The base of the Keyser member is below the base of the section described. 

 At the viaduct on the Baltimore and Ohio Eailroad at Cumberland the 



