824 GEOLOGY OF OHIO 



above the same coal. A little below the Pomeroy seam of coal, on 

 the high knobs east of Lower Sunday Creek, we find many feet of lime- 

 stone. Still further east, we find similar limestones above the horizon of 

 the Pomeroy seam. 



Coal Seams. — The lower coals in this region are generally very thin, 

 and are seldom worked except in a small way for local use. A thin 

 seam is sometimes seen three or four feet above the Maxville limestone. 

 It is only four inches thick in the drift-way at the "Winona Furnace, on 

 Little Monday Creek. In some places a trace of coal is found about 

 twenty feet higher. A seam, three feet three inches thick, is found in 

 Section 16, Madison township. Perry county, about fifty-eight feet above 

 the Newtonville (Maxville) limestone, and it is doubtless to be found 

 elsewhere on the same horizon. 



Twenty or thirty feet higher is a seam of coal of wide range, but 

 always thin in the region now under discussion. Its place is about 

 eighty to ninety feet above the Maxville limestone. There is generally 

 a fossiliferous limestone above it. It has been supposed to be the equiva- 

 lent of Coal Seam No. 3 in the classification of the coals of the First 

 District. Sometimes we find ore upon the limestone. We find a thin 

 coal a few feet above, and, indeed, we find, sometimes, in the space of 

 thirty or forty feet above the limestone, three or four very thin seams of 

 coal. In favorable exposures, all of these are seen ip the same bank. 

 Over the upper one of these coals, we often find a fossiliferous limestone, 

 sometimes passing into flint. This limestone over this coal may help to 

 the identification of the coal with Coal No. 3a of the First District. 

 But we find, sometimes, other limestones or flint layers between Coals 

 No. 3a and No. 3, and when, in a ravine or hill-side, there is an exposure 

 of only one of these several possible limestones, there is great difficulty 

 in determining its exact place. I am inclined to believe that the lime- 

 stone with a thin coal under it, found in most of the valleys of Upper 

 Monday creek, about one hundred and ten feet below the Great or Nelson- 

 ville seam, is the limestone which properly belongs aver Coal No. 3a. 

 In some places the coal is seen without the limestone. In the ravine 

 below the old Maginnis bank, near Old Straitsyille, we find, one hundred 

 and ten feet, by barometer, below the Great seam, a calcareous shale, con- 

 taining shells, etc, with a thin coal below it. Twenty-one feet lower, 

 by Locke's level, is a fossiliferous limestone, with thin coal under it. On 

 another hill, to the north-west of Old Straits ville, a measurement with 

 Locke's level gave one hundred and fifty-five feet to a group seen on Mr. 

 Moore's land, in the valley of Monday Creek, as follows : 



