120 POTTS VILLE FAUNA OF OHIO 



On the property of Harriet A. and W. L. Burris, northwestern part 

 of Section 8, Bloomfield Township, the McArthur horizon is marked 

 by 4 feet of siliceous, very fossiliferous shale. The following geologic 

 section shows excellently the relation of the stratum to the Tionesta 

 coal, as well as to the other members above and below. 1 



Strata exposed on the Burris land, Section 8, Bloomfield Township, 



Jackson County 



Feet Inches 



Allegheny formation 



Limestone, Vanport 4 



Covered 49 



Pottsville formation 



Ore, Black Flint horizon __ 10 



Covered 8 



Shale, gray 3 



Shale, siliceous, very fossiliferous, McArthur 4 



Shale, dark 4 



Sandstone, carbonaceous __ 4 



Shale, black, bony 2 



Coal, good "1 f ._ 10 



Clay > Tionesta i __ 10 



Coal, good J Li 2 



Covered 8 2 



Shale, siliceous 9 



Shale, "dram slate" r _ ,_ 4 



Coal, Upper Mercer, No. 3a 1 11 



In Milton Township, just south of Glenroy, samples of black shale 

 which forms the roof of the Tionesta coal were obtained. Specimens of 

 Lingula carbonaria Shumard were present in great abundance, but no 

 other fossils were found (Locality 81). 



Excellent collecting is afforded in the eastern part of Section 3, 

 Coal Township, from the light, bluish-gray, calcareous, extremely 

 fossiliferous shales which outcrop at the mouth of the old abandoned 

 Tom Corwin mine. The geologic section at this locality follows (Lo- 

 cality 82) :* 



Rocks measured at the old Tom Corwin mine, Section 3, Coal Township, 



Jackson County 



Feet Inches 



Ore, calcareous, Black Flint horizon 8 



Covered 25 



Sandstone, shaly, calcareous, very fossili-^j f 



T . ferous - -\McArthur-. _ J 4 

 Limestone, shaly, very fossiliferous 



Shale, dark, very fossiliferous J L__ 4 



J Stout, W., Geol. Surv. Ohio, Fourth Ser., Bull. 20, p. 186, 1916. 

 2 Idem., p. 174. 



