Maryland Geological Survey 137 



of the Oriskany sandstone, the Xew Scotland, and the Coeymans, and a 

 part of the Keyser. A part of the Tonoloway is also exposed. The middle 

 and lower parts of the Keyser are concealed by weathering of the shaly 

 beds. 



The Oriskany forms the southwest extremity of Fort Hill. The New 

 Scotland is seen below this, containing Spirifer macropleuriis (aa), be- 

 neath which is a zone carrying Meristella arcuata and also several Stroma- 

 topora beds of the upper part of the Keyser. The abundant bryozoan fauna 

 characteristic of the middle Keyser of the Cumberland area occurs about 

 8 feet below the lowest Stromatopora bed, beneath which Tentaciilites 

 gyracantlius (aa), Schuchertella jn-oUfica (c), and crinoids (aa) occur. 

 The junior author also reports the presence of Chonetes jerseyensis in asso- 

 ciation with these species, but it has not been found by later observers. The 

 remainder of the Keyser is concealed. This section affords one of the 

 finest exposures of the limestone beds of the New Scotland in the Cumber- 

 land area. 



The section begins at the bottom of the exposure in the quarry and was 

 measured in vertical thickness.' 



Heldeeberg Formation vertical Total 



Coeymans Memher '"'ftr'tMcknti 



Gray crystalline limestone containing numerous crinoid 

 stems, Gypidula coeymanensis. Atrypa reticularis, etc. A con- 

 glomerate at base contains rounded fragments of limestone. 



Keyser Member 



Thin-bedded gray limestone, distinctly banded with fine 

 brown lines. Ripple-marked surface about a foot above the base 

 of unit. Stromatopora bed at 5.7 feet above base of unit 8.8 50.7 



Heavy-bedded gray limestone, distinctly banded as in above 

 unit. At top of unit is Stromatopora bed 1.2 feet thick. Leper- 

 ditia altoides abundant 9.8; crinoid rings, Lioclema suhramo- 

 sum. Schuchertella sp., Vncinulus sp. 0.6 12.3 41.9 



Thin-bedded, gray limestone, banded like preceding units, 

 unfossiliferous 30 29.6 



Thin-bedded gray limestone not banded or if so very indis- 

 tinctly. Meristella sp. 3.7 6.6 26.6 



^ The lower 13 feet of this section were studied by T. Poole Maynard, the re- 

 mainder by C. K. Swartz assisted in field measurements by J. B. Reeside, Jr. 



