258 GEOLOGY OF OHIO. 



FT. ra. 



23. Shale 10 



24. Sandstone 7 



25. CoallSfo.7 3 



26. Saadstoue 28 



27. stale 14 



28. Sandstone 58 



29. Coalyshale 5 



30. Coal No. 6 6 



31. Shale 13 



32. Sandstone 20 



33. Shale 11 



34. Blueclay 8 



35. Shale 8 



36. Brown shale 4 



37. Notdescribed 34 



No. 3«bf this section was at one time mined by Mr. Speer, under the 

 d6p6t at New Concord, by means of an incline. It is there thirty inches 

 thick, and overlaid immediately by the Crinoidal limestone, five feet 

 thick, and exceedingly hard. The coal obtained here was of excellent 

 quality, but the bed is too thin to be profitably worked. The same coal 

 is worked at Norwich quite extensively by Messrs. J. C. Wiley, William 

 Tudor, John Morehead, and several others. It is about two feet thick, 

 and of very fair quality. The Crinoidal limestone is there seventeen 

 feet above it, and the interval is occupied by shaly sandstone. 



The Norwich coal has been worked at Norwich, but the banks have 

 long been deserted, and no measurement could be made there, but it is 

 said to be two feet thick. In a run north of Norwich, crossed by the 

 Adamsville road, it is seen twenty inches thick. The limestone, nine 

 feet below it, is blue on the fractured surface, but weathers buff, is fossil- 

 iferous, and very tough. It is the "flint rock," No. 8, of the oil-boring. 



The absence of Coal No. 7a in the boring renders somewhat uncertain 

 the identification of Nos. 25 and 30 of the section ; but the Norwich lime- 

 stone is present in the western portion of Guernsey county at from one 

 hundred to one hundred and fifteen feet above the Cambridge coal (No. 7). 

 The interval in the boring between the limestone and No. 25 is only 

 about one hundred and twenty-five feet, so that I am inclined to regard 

 No. 25 as the Cambridge coal. The interval between Nos. 25 and 30 is 

 one hundred and five feet, which is greater than is usually seen between 

 Nos. 6 and 7 in Muskingum county, though about the same as in Guern- 

 sey and Tuscarawas counties. The intervals between the coals of the 

 Barren Group, that portion of the series between Coals No. 6 and 8, seem 

 to diminish westward and northward from a line running through Mus- 



