Maryland Geological Survey 169 



Keyser member. This exposure affords one of the finest sections of the 

 New Scotland and Coeymans limestones in the State.' It is continuous 

 with that of the Keyser member described on a preceding page. 



OEISKANY FOEMATION Vertical Total 



thickness vertical 

 Massive sandstone at south end of Fort HiH. *«** thickness 



Concealed. 



Heldeebebg Formation 

 'New Scotland Member 



Concealed. Interval occupied by shale. 



Gray limestone and interbedded white chert. The chert is in 

 layers six to nine inches thick and forms almost the entire unit. 

 Schuchertella woolworthana and Spirifer perlamellosus occur 

 throughout, Rhipidomella oblata, 16.8; Spirifer macropleurus, 

 16.8, 4.8; Trematospira multi striata, 16.3; Meristella arcuata, 

 16.3, 4.8, 2.8 (a), 0.3; Lepta-na rhomboidalis, 16.3, 4.8; Strepte- 

 lasma strictum (a), Monotrypa spharica, M. tabulata, Dalma- 

 nites pleuroptyx, Phacops logani, Eatonia medialis, 16.3; Stro- 

 pheodonta sp., 14.8; Platyceras sp., Anoplothcca concava, Nucleo- 

 spira ventricosa. Eatonia medialis, Trematospira deweyi, 8.8; 

 Dalmutiella perelegans, Trematospira equistriata, Strophonella 

 undaplicata, 4.8 21.0 29.3 



Medium-bedded gray limestone with a chert layer near the 

 middle of the unit. Dalmanites pleuroptyx, Schuchertella wool- 

 worthana, Leptwna rhomhoidalis, Dalmanella perelegans, Meri- 

 stella arcuata, Rhipidomella oblata occur abundantly through- 

 out the unit. Aviculopecten communis, A. textilis, cf. Lepto- 

 strophia sp., Stropheodonta arata, 5.1; Phacops logani, Schizo- 

 phoria multistriata ? and Strophonella undaplicata, 3.6; Spirifer 

 macropleurus and crinoids, 1.6; Fenestella idalia, Actinoptcria 

 communis (a), Strophonella leavenworthana, Callotrypa macro- 

 pora, 0.8; Vermipora sp., Chonostropia helderhergiw, Fenestella 

 idalia, Anaplotheca concava (a), Spirifer cycloptcrus, Eatonia 

 medialis, Leptostrophia planulata, Strophonella leavenwor- 

 thana, Strophonella pimctulifcra, Spirifer perlamellosus, Stro- 

 phonella undaplicata, 0.6; Spirifer cycloptcrus, Eatonia medi- 

 alis, Strophonella leavenworthana at the base of the unit 5.8 8.3 



Thin-bedded, gray crystalline limestone with several chert 

 layers. Spirifer perlamellosus, 2.1, 1.1; Orthostrophia stropho- 



' Measured by C. K. Swartz, assisted by J. B. Reeside, Jr. The figures 

 following the names of the fossils indicate the altitudes in feet at which they 

 occur above the base of the units. 



