82 ANNUAL REPORT 
It is quite obvious that the composition of the clay substance in 
these clays cannot be as pure as that of refractory clays owing to the 
heterogeneous character of the mineral fragments from which the clays 
resulted. In clays Nos. 2 and 3 the clay substance had the following 
composition : 
Per Cent. 
No. 2 | No. 3 
STS CAA RSE FNS UNCIE lsat CNS Vea MI Mn cea re EA a UCR ed NG 44.86) 48.53 
PA TUTITN TTD aT TALE ate OER Se ATURE UMS 30.50; 28.48 
BE \ ishentk Op ake (ciara hed Mme cpa ght eu MLA eM La aapU Tea WPS) a2 
Biba oVseeraee Nan Vian nl nie MeL Ore mena ue MMA U ya YC Sg esc BIO 24, a: 
Ma ciiesiay ae 6 Balls Sintra iene ies tara c nae ee iy earaaatn a bo aodigt 1h OP! 
PO GAS Eee a SO OMEN eG EEE eA gh Une Mae EID 
120) 9 1292 
SO Ca ere CANO aia nade Me aaUlelte ins Wake SURI Jo ape sNle 
Chemiealuwateryc cinerea tras hones wal ekteg den 8 26) &.70 
IREHHOY HSUIKOZ) Ho) ANNAN. 5 Vo dbnocoogdodocuo0s 1.47) 1.70 
Molecular Ratio, Silica to Alumina............. i ZO} Bosh 
Glacial Clays.—The glacial or drift deposits cover at least two-thirds 
of Ohio in varying thickness. 
“The line marking the most southern drift formation enters Ohio 
in Columbiana county, passes eastward through Stark into Wayne county, 
turning to the southward as far as Holmes county. From this point its 
general direction is southwesterly. It leaves the State in Brown county, 
crossing the Ohio river into Kentucky, a small part of which is included 
in the drift formation. A number of prominent points can be noted by 
which the boundary can be well designated. Newark, Lancaster and 
Chillicothe for examples are situated almost exactly upon the glacial 
boundary.” (Dr. Edward Orton, Geol. Survey, Vol. VII, Part I, p. 38.) 
Where does this material come from? We cannot now enter into a 
detailed exposition of the story of the drift clays and our explanation must 
be restricted to the statement that all glacial clays are a conglomerate 
mixture of native clays, shales, sandstone, limestone and various other 
rocks mostly of igneous origin, which have been brought from the north 
by the irresistible sheet of ice once covering so large an area of Ohio. We 
must keep in mind that the tremendous mass of ice not only ploughed up 
the old rocks, but also carried along those varied rocks which are peculiar 
