STRATIGRAPHY OF FOSSILIFEROUS MEMBERS 19 



shale which were examined were taken from the roof of the mine on the 

 farm of John Alexander, where the geologic section below was meas- 

 ured (Locality 3) : 



Strata measured on farm of John Alexander, near head of Higgins Run, 

 northern part of Section 15, Madison Township, Sdoto County 



Feet Inches 



Pottsville formation 



Shale, gray 10 



Shale, dark, sparingly fossiliferous 2 



Coal, Sharon 2 2 



Sandstone, Sharon conglomerate equivalent 30 



Waverly formation 



Sandstone and shale 40 



In the western part of Section 15, Madison Township, Naiadites 

 etongata Dawson was obtained from the Harry Odle mine in the creek 

 bed, where the dark shales afford good material for collecting (Local- 

 ity 4). This fossiliferous shale is also present at the other mines in 

 the vicinity. In Section 11, the Sharon ore is present above the shales, 

 but it was not examined for fossils. The ore is 10 inches thick and 

 lies nearly 10 feet above the Sharon coal. This bed was formerly 

 mined in Section 22, Madison Township, for use in the charcoal furnaces. 



Jackson County. At the old, abandoned Glen Nell mine in 

 Section 21, Washington Township, about 4 miles northwest of Wellston, 

 the Sharon ore lies practically on the Sharon coal. It is very sparingly 

 fossiliferous, and a diligent search in the coal dumps around the mouth 

 of the mine revealed only a few specimens of Orbiculoidea stoutella n. sp. 

 The geologic section at the Glen Nell mine is given below (Locality 5): l 



Feet Inches 



Sandstone, coarse-grained, interbedded 12 



Ore, Sharon, irregularly bedded with pebbles in places __ 7 



Shale, dark, carbonaceous - __ 4 



Coal, Sharon 3 1 



In the central part of Section 34, Hamilton Township, the ore 

 horizon is replaced by black bone shales which contain abundant fossil 

 remains. Collections were made from the shales outcropping in the 

 road just east of Tattle Creek, where the following section was meas- 

 ured (Locality 6) : 



Feet Inches 

 Shale, gray 5 



Shale, bony, black, fossiliferous, Sharon ore equivalent _. 8 



Shale and covered- _ L 2 



Sandstone, Sharon conglomerate equivalent 3 



'Stout, W., Geol. Surv. Ohio, Fourth Ser., Bull. 20, p. 71, 1916. 



