586 GEOLOGY OF OHIO. 
from the following section, which is exhibited in the quarry of L. 
Halderman & Sons, at Amherst: 
Feet 
Driftimaterial csr: cicsescs cece sonsstscedere tenecen cuss meee eet oc tea tcer eee 1 to 3 
Worthless shellerockiestie i ths acaee ieeeeceraceae ce eeeren oceans 6 toFl0 
PSLOMLG ERO <5 SKOVP fea HUAKOKSTHAVAVETS) CM \¥/G400000 0A00001000000000I0000000000000005060000000100 12 
Building ostOnes i.e cesscsssesseinesswcsie ces clean e eee ee eee 3 
Bid SOISLOINE seesecnucsterocarscissssigecarenscscsmass caer teaeerteen er eaenoeemenectos 2 
GTINGStOM EY acy iascvacccaseses stceceess Sovcteeee sconce eoeaanseeeeee eeeeae camer 2 
LSOUU KC Ubave ROLE) Gye (AMBANCIETTOSAE)s5000 000000900000000000000000.000000200000000 000000 10 
Building iStOM@s.c.:.: sce sccatesicecceecs esse ste caecuecceseea seca temencen ee aeaes 4to 7 
JexDAUkonbaKer EIKOVOVe) CYP. (A AUAVONE{KONE 544.094060000006000900000000000000000 080000 bad00006e 12 
The floor of the quarry, moreover, consists of good stone, which 
has been drilled for 12 feet, indicating a still greater thickness of stone 
which could be extracted. 
The other quarries of the region exhibit a similar diversity of ma- 
terial, although the arrangement is not often the same. As regards. 
colors, the stones may be divided into two classes, called buff and blue. 
The buff stone is above the line of perfect drainage, and in the section 
above given, this extends as far down as the 2 feet of bridge stone, 
forming a total depth of 23 to 27 feet. In most of the Amherst quarries. 
the relative amount of buff stone is greater. 
As will be noted from this section, the different strata are not ap- 
plicable alike to the same purposes, and the uses for which the different 
grades of material can be employed depend principally upon the texture 
and the hardness of the stone. The softest and most uniform in texture 
is especially applicable for certain kinds of grinding, and is used for 
grindstones only, and the production of these forms an important part. 
of the quarry industry. In its different varieties the material is appli- 
‘ cable to all kinds of grinding, and stones made from it are not only sold 
throughout this country, but are exported to nearly all parts of the 
civilized world. Some of the finest-grained material is also used in the 
manufacture of whetstones. ‘There are various points in the system of 
the Berea grit where the stone is adapted to this use, but such a manu- 
facture is best carried on when joined with a large interest in quarrying, 
so that the small amount of suitable material can be selected ; and thus. 
it happens that only at Amherst and at Berea are whetstones manufac- 
tured in large quantities. 
The stone whieh is especially applicable for purposes of construc- 
