Maryland Geological Survey 151 



Vertical Total 

 thickness vertical 

 feet thickness 



Thin-bedded limestone, nodular, containing Aulopora sp., 

 Atrypa reticularis, Chonetes jerseyensis, Schuchertella sp., 

 Polypora dictyota, Fenestella cumberlandica, F. altidorsata, 

 Orthopora rhombifera and crinoid fragments 2.0 79.0 



Massive, heavy-bedded, dark blue nodular limestone. At base 

 occur Camaroticchia sp. and Leperditia sp., 13 feet below top 

 occur Stenocliisma formosa (aa) 33.0 77.0 



Thin-bedded grayish-blue limestone with some chert layers. 

 Camarotwchia litchfieldensis 19.7, 23.7, 39.7, 41.7, Stropheodonta 

 bipartita 2.7 (a), 4.7 (a), 5.7, 7.7, Pholidops ovata 4.7 (a), 

 Whitfiehlella minuta 2.7, 19.7, 23.7, Leperditia altoides 23 (a), 

 25, Spirifer vanuxemi 44.0 44.0 



Thickness of Keyser member 289.6 



TONOIX)\VAY FORII.XTIOX 



Concealed. Some fragments of platy thin-bedded limestone 

 in soil. 



The following species were found at this place, their exact horizon being 

 unknown : Cyathophyllum clarl-i, Cladopora rectilineata, Aulopora scliu- 

 clierti, Hcdysites catenulatus. 



IX. Section at Corriganville 



On the south side of Wills Creek, on the strike of the Helderberg strata 

 of the Devirs Backbone, is an exposure of limestone in the abandoned 

 quarry known as Corrigan's quarry. On the west side of the quarry 

 Spirifer macropleurus and S. perlamellosus of the New Scotland and other 

 forms occur in abundance. East of the preceding a Stromatopora bed of 

 the Keyser is exposed with a thickness of 5 to 7 feet. Ten to 15 feet 

 below this is another Stromatopora bed on the extreme east side of the 

 quarry. Some Lower Keyser fossils, including Atrypa reticularis and 

 Calyniene camerata, were found loose on the hillside southeast of the 

 quarry. 



There is also an admirable section in the cut of the Pittsburg extension 

 of the Western Maryland Eailroad through this hill in which all of the 

 .strata are exposed from the base of the Oriskany to the middle of the 



