240 GEOLOGY OF OHIO. 
Coal No. of section was observed only in Union township, between 
New Concord and Norwich. The limestone underlying it is more or less 
fossiliferous. Iwas at one time inclined to regard this as perhaps the 
western prolongation of the Pittsburgh, but no proof has been found to 
substantiate the conjecture. The coal is of no value. 
The Crinoidal limestone is fully described in the report on Guernsey 
county. In Muskingum it is shaly and coarse-grained, wanting the 
compactness and flintiness characteristic of it in Guernsey, Harrison, 
and Carroll. It is well exposed in Highland, Monroe, Adams, and Salem 
townships, and runs out in the hills of Madison, about three miles east 
of the river. The only species found here, aside from those given in the 
list from Guernsey, 1s Clenoptychius semicircularis, of which a single speci- 
men was obtained in Salem township. 
Coal No. 7b is seen at a distance of from one to thirty-five feet below 
the limestone. It appears to be ef economical importance only in the 
vicinity of Norwich, in Union township, where it is thirty-four inches 
thick. Toward the north it becomes thinner, and averages only ten 
inches through Salem, Adams, Monroe, and the greater part of High- 
land. Where of available thickness, it appears to be a very good coal. 
The coal which I have termed the “Norwich” coal is quite circum- 
scribed in area. Both it and the underlying limestone disappear north- 
ward. It is worked in Highland and Union townships to a slight ex- 
tent. The limestone under it is blue, weathering buff, very tough, and 
contains many fossils, among them Productus costatus,? P. punctatus, P. 
longispinus, P. Prattenanus, Athyris subtilita, and Chonetes granulifera. 
Coal No. 7 is as variable here as in the adjoining county of Guernsey. 
South of the Central Ohio Railroad it attains great importance, but thins 
out abruptly northward, being seldom more than one foot thick, and 
usually a cannel of poor quality. At one or two points it suddenly ex- 
pands to nearly six feet, but yields an inferior coal. It was seen.in Mon- 
roe, Adams, Madison, Washington, and Muskingum townships. 
Coal No. 6 is the important bed of the county. It is the upper coal at 
Coaldale, near Zanesville, and is mined extensively in Monroe, Adams, 
Madison, Washington, and Muskingum. The thickness varies from three 
to four feet. The upper part of the bed usually consists of hard, slaty 
coal, four to six inches thick, burning well, making a hot fire, but leay- 
ing much ash. Six to ten inches from the bottom is a very persistent 
clay parting about two inches thick. Other partings are sometimes seen, 
but they are not persistent. Ordinarily the coal is of excellent quality, 
containing little sulphur and yielding a very superior coke. In some 
