138 The Lower Devoxiax Deposits of Marylaxd 



Vertical Total 

 thickness vertical 

 feet thicl4neS3 



Medium-bedded gray limestone, lower part showing distinct 

 banding. Stromatoporoids in layer one foot thick 2.2 to 3.2 

 feet above base; Orthopora rhomhifera, Fistuliporella cumulata, 

 ostracods 4.9 8.8 



Two beds of gray limestone separated by a shale parting. 

 Ostracoda, Schuchertella prolifica, Vncinulus keyserensis 0.8. . . 1.8 



Thin-bedded, shaly gray limestone, Uodlema suhramosum 3.9, 

 2.3, 1.6; Schuchertella prolifica 3.9, 2.3 (a), 1.6, 0.4; Tentaculites 

 gyracanthus 2.8, 2.3, 1.6 0.4; Vncinulus keyserensis 3.9, 2.8, 

 2.3; Meristella pranuntia 3.9, 2.8; Eridotrypa parvulipora, Or- 

 thopora rhomhifera, Mesomphalus hartleyi 2.8; Kladenella 

 clarkei 1.6, Klccdenia nearpassi 3.9; Chonetes jerseyensis at top 

 and base * 4.8 



Single bed of light gray limestone which weathers into thin 

 beds, unfossiliferous 3.0 



Thin-bedded, shaly limestone weathering to a light gray or 

 brown color, Tentaculites gyracanthus and Meristella prwnun- 

 tia throughout; Lioclema suhramosum 1.5, Vncinulus keyser- 

 ensis 0.9 ; Orbiculoidea schucherti 0.9, 0.5 1.6 



Concealed below this. 



Thickness of Keyser member exposed 50.7 



in. Section at Cookerly ^ 

 There is an excellent exposure of the lower part of the Keyser limestone 

 and of the upper portion of the Tonoloway formation about two and a half 

 miles southwest of Eawlings, at the first curve on the Baltimore and Ohio 

 Eailroad southwest of Cookerly. This section is of special interest because 

 the lower part of the Keyser contains a heavy bed of stromatoporoids which 

 has not been observed elsewhere in this position in the Cumberland area, 

 although it is known to occur in a similar horizon at Hyndman, Pennsyl- 

 vania. The fauna found above and below the Stromatopora beds shows 

 that it is to be referred to the Keyser. The Keyser occupies the center of 

 a syncline. The underlying Tonoloway limestones are thin-bedded and 

 contain few fossils. 



' Chonetes jerseyensis was reported in abundance by Dr. T. Poole Maynard, 

 but subsequent search failed to reveal its presence. 



- This section was measured by C. K. Swartz. The fauna was studied by T. 

 Poole Maynard. 



