STRATIGRAPHY OF FOSSILIFEROUS MEMBERS 49 



other parts of the State, large crinoid stems everywhere characterizing 

 the deposit. 1 



Description of Geologic Sections and Collecting Localities 



Lawrence County. The Lower Mercer limestone is present in the 

 western part of Lawrence County where it is reported to be fossilifer- 

 ous. No fossils, however, were collected from the county, but an ex- 

 cellent specimen of Metacoceras pottsvillensis n. sp. in the Geological 

 Museum of The Ohio State University was obtained from the member 

 near Hanging Rock in the southeastern part of Hamilton Township 

 (Locality 30). 



Scioto County. About four miles south of Lyra in the extreme 

 southeastern corner of Vernon Township, the Lower Mercer limestone 

 is exposed on land of Edward Toffins in the field east of the road, about 

 100 feet above the base of the hill (Locality 31). The stratum at this 

 locality is light buff in color and somewhat siliceous and ferruginous in 

 composition. Fossils occur abundantly between the layers, and differ 

 from the general type of Lower Mercer forms in being larger and more 

 robust. The section measured at this point follows: 



Feet Inches 



Limestone, f ossiliferous, Ferriferous '_ 4 



Covered 60 



Sandstone, massive 55 



Covered 10 



Sandstone, massive 20 



Shale 1 6 



Coal, Upper Mercer, No. 3a 1 6 



Covered , 28 8 



Limestone, ferruginous, very fossilif erous, Lower Mercer 1 



Covered 4 



Sandstone 2 * 



The fossils listed below were collected from this locality: 



Crinoid segments 

 Archaeocidaris spines 



Fenestella shumardi Prout? 



Fenestella, two or more species, undetermined 



Septopora biserialis (Swallow) 



Septopora biserialis var. gracilis (Meek) 



Cystodictya carbonaria (Meek) 



Orbiculoidea meekana (Whitfield) 

 Rhipidomella pecosi (Marcou) 



J Lamb, G. F., Pennsylvanian Limestones of Northeastern Ohio below the Lower 

 Kittanning Coal, Ohio Naturalist, Vol. 10, March, 1910, pp. 89-135. 



