STRATIGRAPHY OP FOSSILIFEROTJS MEMBERS 37 



isolated patches, and varies in thickness from 1 to 6 feet in Scioto and 

 Lawrence counties, with an average of 3 feet; however, in Jackson 

 County only about 8 inches is present. Formerly this ore was used 

 commercially to a large extent in charcoal furnaces especially in Jackson 

 and Scioto counties, although at the present time it is no longer utilized 

 for this purpose. Northward in Muskingum County the typical Boggs 

 deposit consists of limestone, but iron ore, shales, sandstone, or flint 

 may be present with the limestone or may entirely replace it. The 

 limestone, where present, is often bluish-gray, very hard, and very 

 fossiliferous, closely resembling the Lower Mercer limestone in litho- 

 logic character. The fossils, although essentially similar to those of 

 the Lower Mercer, are much larger and more robust in appearance. 

 The member is here less than 2 feet in thickness. In Tuscarawas- 

 County a blue limestone was reported by Dr. Edward Orton to occur 

 occasionally at what appears to be the Boggs horizon, about 34 feet 

 below the Lower Mercer member; it has a thickness of 1 foot 6 inches 

 near Bolivar in the northern part of the county. Further stratigraphic 

 studies may reveal the presence of the Boggs member in the counties 

 to the northeast. 



Description of Geologic Sections and Collecting Localities 



Scioto County. The following section was measured on the 

 William M. Galligher farm, in the southwestern part of Section 24, 

 Bloom Township. No fossils were found in the Boggs ore of southern 

 Ohio, but they were discovered to be present sparingly in the shales 

 associated with the ore (Locality 23). x 



Feet Inches 



Shale 5 



Coal, Upper Mercer or No. Sa 1 4 



Covered .' 54 



Sandstone, with finger coal at bottom 1,5 



Unconformity 



Shale, dark, fissile 1 3 



Ore I ] r __ 4 



Shale > Boggs < __ 2 



Ore J [ _. 11 



Shale, blue... * 3 



The fossils collected from the dark shales on the William M. Gal- 

 ligher farm are listed below: 



Lepidodendron sp. 

 Naiadites elongata Dawson 



'Stout, W., Geol. Surv. Ohio, Fourth Ser., Bull. 20, 1916. Geologic section 

 given in part on page 568. 



