MORROW COUNTY. 



259 



fine-grained, and micaceous. The mica scales appear specially on the 

 planes of bedding. Although this stone is usually soft, and crumbles 

 under pressure, or on exposure to the weather, some of it is harder, yet 

 equally fine-grained, and in beds of about a foot. It is quite distinguish- 

 able from the Berea grit as seen at Mt. Gilead, or at Leesville, in Craw- 

 ford county. It sometimes shows, at Mr. Lavering's, masses of hard, 

 blue, silicious limestone. Irvin Lefever has a slight exposure of similar 

 beds on his farm, three-fourths of a miles south-east. 



The Berea Grit- — The quarries in the Berea grit near Iberia are owned 

 by 0. C. Brown, section 23, J. J. McLaren, section 34, David Colmery (not 

 now worked), John T. Quay, Benjamin Sharrock. Stone also shows on 

 Mr. Gurley's land, a quarter of a mile south-east from McLaren's quarry. 

 That of Mr. Brown covers the horizon in which fall all the others. The 

 section here is as follows, in descending order. The beds lie so nearly 

 horizontal that no dip can be distinguished: 



Section in the Beeea Grit at Iberia, Morrow County. 



No. 1. Drift •- 3 feet. 



" 2. Thin beds of sandstone, with distinct ojiartzose grains ; beds 2 to 5 



inches 18 " to 22 feet 



" 3. Heavy beds of sandstone (1 to 3 feet), with evident qnartzose grains, 



yet finer than the Berea grit 18 " to 22 " 



" 4. Shale (in a talus, poorly seen) 30 " 



The thirty feet of shale (No. 4, above) is obtained by measuring from 

 the level of the water in the Rocky Fork of Olentangy Creek, which 

 passes near Mr. Brown's quarry, to the bottom of the sandstone in the 

 quarry. This interval is known to be occupied by shale, but its special 

 characters are hid by the sloping turf-covered talus. It can only be seen 

 about six inches below the sandstone, where it is fine and blue, and in 

 beds one-half to one and a half inches. It thus appears that the heavy 

 beds of the Berea continue intact down to the shale, as in Crawford 

 county, although at Mt. Gilead the heavy sandstone graduates below into 

 a thin-bedded and shaly sandstone, before the beginning of the shale. 



