Maryland Geological Survey 163 



Vertical Total 

 thickness vertical 

 feet thickness 

 Spirifer vanuxemi with angular ribs, and Atnjpa reticularis, 



206.1; Atrypa reticularis (a), Tentaculites gyracanthus, 203.5; 



Dalmanella concinna and Ptilodictya tenella. 199.9 14.0 211.1 



Rather shaly, cobbly limestone. Leptana rhomboidalis (a), 

 197; Stropheodonta bipartita, 196.6; Dalmanites n. sp., 255.4, 

 193.8, and 188.5; Actinopteria sp., Schuchertella deckerensis, 

 Vncinulus keyserensis and Stromatotrypa glohularis, 193.1; 

 Atrypa reticularis. 193.1, 188.5, 187.9, 187.7; Chonetes jersey- 

 ensis. 193.1 (a), 188.5, 187.7 (a); Anoplotheca concava var., 

 187.9; Gypidula coeymanensis var. prognostica, 187.7 12.0 197.1 



Massive, cobbly limestone. Atrypa reticularis and Gyplio- 

 trppa corrugata 4.0 185.1 



Somewhat shaly limestone breaking into irregular laminae. 

 Dalmanella concinna, Vncinulus keyserensis, Fenestella (Cyclo- 

 porina) altidorsata and crinoid fragments, 181.1. Schucher- 

 tella proUfica and Fenestella altidorsata, 179.6; Tentaculites 

 gyracanthus at base 6.0 181.1 



Single layer of finely cobbly limestone; basal part bored by 

 worm tubes. Chonetes jerseyensis (a), Stropheodonta bipar- 

 tita, Vncinulus keyserensis, 159.3 24.0 175.1 



Somewhat clayey, finely cobbly limestone 2.8 151.1 



Slabby crinoidal limestone containing some corals. Cypho- 

 trypa corrugata 1.0 148.3 



Finely cobbly limestone, massive when fresh, but breaking up 

 on weathering into irregular pieces and cobble. Small reef of 

 Stromatoporoids and Favosites near top and a thicker one 

 near base. Camarotwchia litchfieldensis, 135.9; Favosites sp., 

 and Spirifer vanuxemi with angular ribs, 131.2 , 21.0 147.3 



Subcrystalline limestone, banded with thin clay seams. Con- 

 tains fossil fragments 5.0 126.3 



Subcrystalline limestone, irregularly bedded with thin clay 

 seams and containing large crinoid columns. Atrypa reticularis 

 throughout; Spirifer octocostatus ?, Fenestella cumberlandica 

 near base 5.0 121.3 



Thick-bedded, subcrystalline limestone. Atrypa reticularis 

 and Vncinulus sp. at top; Rhynchospira formosa and corals 

 at base 7.0 116.3 



Finely cobbly limestone with Favosites and massive bryozoa. 

 Camarotachia litchfieldensis, Schuchertella deckerensis, and 

 Cyphotrypa corrugata (a), 107 6.5 109.3 



Thin slabby and shaly limestone, argillite in part. Elwdenella 

 clarkei abundant; Schuchertella deckerensis, Meristella sp., 

 Stropheodonta bipartita, Camarotachia litchfieldensis (a). 

 Base of this unit is 130 feet west of base of section measured 

 along track 4.0 102.8 



