532 GEOLOGY OF OHIO. 



Ft. In. 



5. Not exposed 59 



6. Dark brown shale 20 



7. Yellow shale 10 



8. Sandstone passing down into shale '. 30 



9. Ore— siderite and limonite 7 



10. Nodular limestone 6 



11. Shale 5 



12. Laminated sandstone and shale 32 



13. Coal 1 3 



14. Fire-clay 3 



15. Shaly san.dstone 10 



Level of railroad track. 



In this section the strata in the slide could not be measured, and the 



thickness was estimated. No trace of the Cambridge seam of coal was 



sen. A section was made in the village from the bed of Wills Creek, 



at the site of the old mill, up to a seam of coal in Mr. Isaac Morton's 



field, on the hill-side above, as follows : 



Ft. In. 



1. Heavy, coarse sandstone, seen 10 



2. Coal, varying from 1 ft. 3 in. to 2 



Not all seen, hut the lower part a very heavy sandrock, with vast 



concretionary masses of " blue core " rock 39 



4. Level of the railroad. 



5. Interval to bed of creek, lower part shaly sandstone 27 



6. Coal, once mined by stripping in low water in Wills Creek (reported) 2 9 



(Map XII., No. 5.) 



The upper coal in this section is believed to be the equivalent of the 

 Cambridge coal, or Scott's coal. It is generally covered with shale. The 

 same seam is found under the floor of the shop of Louis Schreier, on Main 

 street. It has an elevation of thirty-seven feet above the railroad track 

 at the station. 



A level from this coal strikes a bench on Tunnel Hill a little above the 

 tunnel. A trace of .coal was found on this bench. Every where in the 

 immediate vicinity of the town of Cambridge the Cambridge seam is 

 very thin, and this fact has created the chief difficulty in identification. 

 Two or three miles south of Cambridge the seam becomes thick enough 

 for mining, and presents in that region a fine development. In this 

 neighborhood the following section was taken at the coal bank of Andrew 

 Nicholson : 



Ft. In. 



1. Sandstone 12 



2. Clay shale, laminated 4 6 



3. Coal 3 10 



4. Clay parting li 



5. Coal 1 



6. Underclay 3 



