408 GEOLOGY OF OHIO. 
Ames limestone. 
Interval—not measured. 
Cambridge limestone. 
Interv aleee Be Bee eee Aa Oe ee: BUAt de reeudeecmneeeameneneees 50 feet. 
Brush Creek coal—No. 7a, 
TNteRVvah oecsc. cnctvecas wexttestedelsadcesen seems mata cee 150009900000000 45 feet. 
Whitlock ore—Upper Freeport coal—No. 7. 
IMterval’.cetec icles tiescesaccecuca'ecasutioussecvetceceesatucemereine meremeaeees 61 feet. 
Nodular ore and fire-clay—Lower Freeport horizon ? 
Tantervyals AAs iecditeh15 5 ISR ee ee recA 51 feet. 
Middle Kittanning coal—No. 6. 
From lowest coal to ore, 117 feet; from same to Cambridge limestone, 212 feet. 
So far as worked, the seam has ranged between 13 and 4 feet in 
thickness. It carries enough coal and carbonaceous matter to effect its 
calcination. It is under much heavier cover than most of the ore 
bodies of this horizon. In fact, not another occurrence of genuine 
blackband has been noted in the State directly beneath the Ames lime- 
stone. The area already mined will not exceed an acre, but the hills 
come down so abruptly that the possibilities of tailing or stripping the 
ore have already been exhausted. Drifts have been pushed under the 
hill, but they are not now open. According to what seems reliable 
testimony, the ore was left at full thickness at the head of the drifts. 
If this be true, there is still a considerable amount to be looked for in 
this region. ‘The horizon can be marked through a large territory. 
All the ore that was mined here, was taken to Moxahala Furnace. The 
raw ore contains 36 per cent. of iron. 
There is another important field near Bristol, in the southwestern 
corner of Pike township. ‘Two bodies of the ore have been found and 
worked in sections 29 and 32, respectively. The former is known as 
the Clark ore from the name of the farm on which it occurs; the latter 
is, for a like reason, called the Bowman ore. Both have been worked 
quite largely, the former for Moxahala Furnace, and the latter for the 
Shawnee furnaces. The average thickness of the Clark ore is less than 
15 inches. The Bowman ore covered originally about 22 acres, and 
probably two thirds of it have been mined out. It occurs in two benches, 
separated by about 15 inches of shale. The upper ore bench is 6 inches 
thick; the lower ranges between 12 and 15 inches. The ore is mainly 
mined by stripping. A tram-way conveys it from the mine to the rail- 
road at McCuneville. These deposits are not equal in value to the 
Tron Point beds. They fall below in thickness, and perhaps also in 
