. 
Notice of Geological Surveys. 135 
Dislocations of a few inches are occasionally seen. 'The rocks 
dip very gradually toward the west. -‘‘ Large quantities of argilla- 
ceous iron ore and carbonate of iron are associated with the slaty 
clays of the formation at its eastern border, where are” excel- 
lent fire clays, potter’s clay, furnace hearth-stones, and slates, 
from which copperas and alum can be manufactured on a large 
scale. Sandstones for building, for grind and whetstones, are 
very superior. 
Boring for salt water through the white sandstones at the mar- 
gin of the coal formation is encouraged, as they are regarded by 
De. Owen as the equivalent of the saliferous formation of the 
Muskingum.and Kenawha. “A brine affording a pound of salt 
from a gallon of water was procured near the mouth of Coal 
Creek, in Fountain county,” from a boring that passed through 
the.coal beds themselves to the depth of seven hundred feet. 
Between the “soft, fine-grained, greyish or brownish grey sand- 
stone of the knobs in Floyd county, and the coal formation” is a 
series of limestones, the “oolitic” or “encrinital,” of Kentucky 
and of Tennessee, described by Dr. Troost in the iron region of 
Tennessee. “This limestone formation isthe termination of the 
true carboniferous and. saliferous rocks, and is distinguished by 
the two characteristic fossils, the Pentremite and Archimedes, 
and by its oolitic structure. « It constitutes the only remarkable 
difference of the-rocks of Indiana from those of Ohio, the latter 
having instead a conglomerate from forty to eighty feet thick 
Succeeding the Waverly sandstone rock, aud the former a series 
of limestone some two hundred or three hundred feet thick, with 
a great variety of fossil remains.” : : 
he view here presented of the rocks of Indiana and Ohio, in- 
dicates, we think, 1, That they. were ence continuous and un- 
broken, as the blue limestone now is, which is the base of the 
whole, If this be so—2. 'That they were deposited upon a base 
originally higher at about the junction of the two states, or there 
has been subsequently a local elevation at this point. 3. The in- 
Clination of the strata as given by Dr. Locke, ina colored map and 
Section of Adams county, would carry the top of the coal strata of 
Scioto, (the next county east,) if continued to the west line of Ad- 
ams county, toa height of eleven hundred and sixty feet above it, 
and if they be continued to the longitude of Cincinnati, say fifty 
ne miles west, “at the rate of one hundred feet in three miles” 
