736 GEOLO&Y OF OHIO. 



' LINTON. 



The geology of the country immediately about the mouth of Yellow 

 Creek has been frequently referred to in the pages of this report, and is 

 described somewhat at length in the Report on the Geology of Colum- 

 biana County, which forms another chapter in this volume. The hills . 

 which border the Ohio here rise to the height of about five hundred feet 

 above the river. Throughout the upper three-fifths of this height they 

 arc composed of the shales of the Barren Measures, while the two hun- 

 dred feet of strata below include all the workable coals in this region. 

 With some local variation, this section is parallel with that at Irondale, 

 the fall of Yellow Creek keeping pace with the south-easterly dip of the 

 strata. 



Coal No. 7 is on the south side of Block House Run, one hundred and 

 sixty-six feet above the railroad and Coal No. 4. On the north side, and 

 near the station, it is one hundred and eighty feet; further back, at 

 GrofT's mine, it is one hundred and ninety-four feet above the railroad, 

 which is in turn one hundred and fifteen feet above Lake Erie. This 

 coal is from three to four and a half feet in thickness, and has long been 

 worked at the mine of Mr. J. Groff, from which it has taken the name of 

 the " Groff Coal." Its quality is good. On the west side of Block House 

 Pun it has been known to exist, but has not been opened. The section 

 on the Diamond property is as follows: 



FT. 



1. Shales of the Barren Coal Measures 375 



a. Coal No. 7 3 



3. Fire-clay 4 



i. Shale : 10 



5. Grey limestone 5 



, C. Sandstone aad shale 50 



7. Coal No. 6 7 



t?. Fire-clay 5 



y. Interval. Mostly shale and sandstone; reported to contain Coal No. 5, 



■wiili limestone ni>der it 70 



. 10. Black shale, with iron ore 15 



11. Coal No. 4 (" Strip") 2 



li. Fire-clay and limestone 4 



13, Shale, with iron ore 20 



14. CoalNo.3 ("Creek") 4 



15. Fire-clay 5 



16, Shale and sandstone, with a thin coal to river 17 



Coal No. 6, at Linton, is thicker than in any other locality in the 

 northern part of the county. It usually runs from six to seven ffiet, 

 but in some places is seven feet three inches. It is a highly coking 

 coal, of average quality, containing considerable sulphur, and showing 



