LOGAN COUNTY. | 487 
proposed to open a quarry in it. Doubtlees it will yield fine blocks of 
beautiful stone, but as soon as fairly opened the quarry will fail from 
exhaustion. 
The Oriskany sandstone should be dropped from the Logan county scale. 
Below the Corniferous lies the great sheet of Helderberg or water-lime, 
the lowest formation yet seen in the county. It has been worked on 
General A.S. Piatt’s land on the Mackachack, and at Northwood, Hunts- 
ville, Richland, and Belle Centre. At the latter point is Anderson’s 
quarry, probably the best and largest in the county. Much of the stone 
in this quarry is in thin and smooth courses, and makes excellent flag- 
ging. The yield of stone is stated at about 1,000 perches annually, worth 
$1.25 per perch in Belle Centre. Some of it is shipped on the Sandusky 
Railroad, but local demand consumes the greater part of it and all of the 
lime burned. 
At the depth of fifteen feet a course is reached tisat is of so little value 
that it is avoided. As there is only two feet of “stripping,” it is easier 
to extend the work sideways than downward. 
he conformation of the surface of Logan county indicates that under 
Miami, Pleasant, and Bloomfield townships perhaps the Helderberg stone 
has been scoured off, and that, were the masses of drift penetrated, the 
first fixed rock found would be the Niagara. But the highest point.where 
the Niagara has teen worked is Tremont, in Clarke county, and the loca- 
tion of that formation on the Logan county map is a matter of pure con- 
jecture. 
MATERIAL RESOURCES. 
The chief source of wealth in Logan county must ever be its agriculture, 
for which the valleys of Miami and Mad River are especially adapted, 
while even the hilliest townships are by no means barren. 
The rocks yield building stone in sufficient quantities for all local 
demands, although peculiar circumstances and a freak of fashion at pres- 
ent bring stone from distant counties for the more important structures, 
and they can supply lime for building or farming purposes in such quan- 
tities and at such prices as to defy competition from abroad. 
The islands of Huron shale are, perhaps, capable of supplying hydraulic 
lime, though at present entirely unused. 
Beds of clay exist in every township, suitable for brick, tile, and coarser 
pottery, and are now worked to some extent. At Hast Liberty, Lewis- 
town, Rushsylvania, and other points are gocd tile works, fully equal to 
the local demand. 
Underlying the marsh, at the head of Rush Creek Lake, is an immense 
deposit of white shell marl, that would be of great value to the poorer 
