Williams.] ANDREWS AND READ. 183 



sandy shales. The fine-grained sandstone lying above the Waverly 

 conglomerate was first investigated in the vicinity of Logan, Hocking 

 County, and thence received the name of " Logan sandstone." The 

 whole thickness of the Waverly formation is about 640 feet. Fucoid 

 stems are abundant and in the Logan sandstone in addition to these are 

 found three varieties of an unnamed vegetation. 



The Maxville limestone, lying directly above the Logan sandstone, is 

 overlaid by a few feet of soft, coarse sandy shale and 40 to 50 feet of a 

 soft laminated sandrock. Above this is a coarse sandrock rich in im- 

 pressions of Lepidodendra. A considerable collection of fossils was 

 obtained from the Maxville limestone at Newtonville, Muskingum 

 County. A list of species and genera is given, of which eight species 

 are Chester types and two are identical with species from the St. Louis 

 limestone, leading the author to conclude that this Maxville limestone 

 represents the Chester group of the Lower Carboniferous limestone 

 series, while there may be some representation of the St. Louis lime- 

 stone at some of the outcrops. These local patches of Maxville lime- 

 stone never exceed 15 to 20 feet in thickness, and are generally no more 

 than 8 to 10 feet thick, while in Kentucky the limestone is found nearly 

 100 feet thick. 



The true Coal Measures Conglomerate is seen resting upon the Logan 

 or Upper Waverly over limited areas. In general where there is Max- 

 ville limestone there is no Conglomerate. 



In Vinton County a section is given showing the Waverly Conglom- 

 erate aud the Logan sandstone extending up to the coal. 



No true Coal Measures Conglomerate is found, but the coal, with its superin- 

 cumbent shales, rests directly upon the Logan sandstone. This valuable section 

 tends to verify deductions made elsewhere in regard to the Waverly conglomerate, 

 and also in regard to the entire absence over certain large areas of the true Coal 

 Measure Conglomerate. At this place no Maxville limestone was found resting upon 

 the top of the Logan group. 



Mr. Read reported that in Holmes County the lowest rocks observed 

 belong to the Waverly sandstone, the ravines sometimes cutting down 

 fully 200 feet into it. The Conglomerate appears above the Waverly 

 in Prairie Township, and has a maximum thickness of 18 feet, with 

 fossils which Mr. Meek determined to belong to the Carboniferous forma- 

 tion, pointing to the deposition of a Subcarboniferous limestone which 

 has been cut out or removed by the agencies which brought in a deposit 

 of the Conglomerate. Generally in the county the Conglomerate is want- 

 ing, and is represented in places by a thin layer of coarse sandstone 

 without pebbles, sometimes by hard, compact, white siliceous rock a 

 few inches in thickness and filled with Stigmaria, and sometimes the 

 Coal Measures rest directly on the Waverly. 



In the second volume of the Ohio Reports 1 the Carboniferous system 

 of Ohio is classified. 



•Report of the Geological Survey of Ohio, vol. 2, pt. 1, Chapter xxxi, by J. S. Newberry, chief 

 geologist, 1874. 



