BEAR RUN COAL HORIZON 



Stratigraphy and Extent 



The shales and black band ore associated with the Bear Run 

 coal constitute the next fossiliferous horizon above the Quakertown 

 coal. Although absent in some localities, the stratum is fairly persis- 

 tent in southern Ohio, and extends from Scioto County through Jack- 

 son and Vinton as far north as Muskingum County. 1 In Scioto 

 County the interval between the Bear Run coal horizon and the 

 Sciotoville clay with the associated Anthony coal varies from 62 to 86 

 feet with an average of 71 feet; northward in Jackson County the 

 interval is somewhat less, from 20 to 80 feet with an average of about 

 60 feet. 2 In Muskingum County this distance measures about 45 feet. 



The Bear Run coal attains its greatest development in the Dever 

 Valley in Hamilton Township, Jackson County, where it is of good 

 quality and has been mined for local use for many years. Its thick- 

 ness varies from 1 foot to 2 feet 6 inches, with an average of almost 

 2 feet. The character of the deposit varies greatly from place to 

 place, and the coal may be interbedded with or replaced by shales 

 and black band ore. In Scioto County the coal is thin or is replaced 

 entirely by carbonaceous shales, while along Tattle Creek, south of 

 the Dever Valley, the deposit gives way to sandstone. In Lick Town- 

 ship, Jackson County, the coal is interbedded with dark fissile shales 

 and black band ore; in Muskingum County the member is thin and 

 is usually represented by dark, carbonaceous shales. Fossils are 

 fairly abundant in number of individuals, but with the exception 

 of a single fish plate, all the specimens discovered belong to a single 

 species of the fresh or brackish water pelecypod, Naiadites elongata 

 Dawson. Collections were made from various parts of Scioto and 

 Jackson counties. 



Description of Geologic Sections and Collecting Localities 



Scioto County. In Section 3, Bloom Township, on the land 

 of H. H. Stevenson, Naiadites elongata Dawson occurs in the dark 

 shales overlying the Bear Run coal. The following section was meas- 

 ured here: 3 



Ft. In. 



Sandstone, massive 6 



Shale, blue, tough, lower part fossiliferous 7 



Coal, Bear Run, upper part somewhat bony 2 4 



Jackson County. Along the Dever Valley in the southern part 

 of Hamilton Township, the shales above the coal are everywhere 

 fossiliferous, and collections of Naiadites elongata were made at various 

 places along the valley. One of the best collecting localities was 



iStout, W., Geol. Surv. Ohio, Fourth Ser., Bull. 20, p. 15, 1916; Bull. 21, p. 60, 1918. 

 2Stout, W., Geol. Surv. Ohio, Fourth Ser., Bull. 20, pp. 115, 552, 1916. 

 3 Idem, p. 556. 



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