380 GEOLOGY OF OHIO. 



mately as follows : Below the soil are, first, a buff-colored shale, some 

 twenty-five feet in thickness ; below this a darker shale, ten feet thick — 

 both these shales are valuable for pigment ; below these shales a layer of 

 iron-stone, one foot thick ; then follow alternate layers of soft shale and 

 the whetstone rock, thickness not easily determined. Passing down the 

 ravine a few rods, a shaly sandstone is exposed, which gradually runs 

 into a coarse-grained rock, containing very small pebbles. This ravine 

 gives a section of eighty or ninety feet. 



An analysis of the iron-stone found in Mineral Run was made by the 

 State Chemist, Professor Wormley, at the request of Col. A. Munson, 

 member of the Legislature from Medina county. It had been supposed 

 to be quite rich in iron, but the analysis showed that it contained only 

 two and one-half per cent, of metallic iron. 



The Eureka Paint Mills make two tons of paint per day. The principal 

 materials used are the shale from Mineral Run, Lake Superior iron ore, 

 and a mineral from Brandon, Vermont. 



YORK TOWNSHIP. 



The soil of this townahip is for the most part clay, the surface of the 

 land being level. There is an exposure of shaly sandstone in the ex- 

 treme north-east corner of the township. Beds of this, ten feet thick, 

 show for quite a distance along Rocky River, but at exposures lower 

 down the stream, in Liverpool township, it is seen to run into a mixture 

 of sandstone and shale, the latter differing noticeably from the beds still 

 lower in the series, because of the absence or scarcity of concretions — 

 weathered specimens of the sandstone split into thin sheets. The con- 

 cretionary beds are seen in the bluffs a quarter of a mile north of the 

 Abbeville bridge, and the shale is there harder than further down the 

 river, where fossils were found in abundance The upper layers of these 

 concretionary beds are dark gray, and they are pressed in upon them- 

 selves, many layers showing the shale broken into small pieces and 

 massed on edge. The concretions are out of their usual horizontal posi- 

 tions Some layers, ten inches thick, disappear altogether in a distance 

 of less than six feet. 



