502 | GEOLOGY OF OHIO. 
irregular, heterogeneous heaps. The former are indicative of the milder, 
pains-taking action of water. 'The latter, of the more violent and reck- 
less agents—glaciers and icebsrgs—though it must be borne in mind, 
that the regular, distinct laminations may frequently result from the 
subsequent action of water upon the confused mass of glacial deposits. 
The constituents, origin, and causes of the Drift have been so re- 
peatedly and.so exhaustively treated in Vols. I and I! of the Reports of 
the Ohio Geological Survey, that it is not mOGaSHALy to enter into an ex- 
tended discussion of them here. 
The various phases of the Drift formation are fully and, in a few neces, 
finely shown, but the structure is rendered, I think, somewhat more diffi- 
cult to unravel, for the reason that the county lies at about the junction 
of the two grand systems of forces acting from the region of the Lake and 
_ that of the Ohio. There appears to be no uniformity in the divisions of 
the deposits, no two sections showing the same succession of parts. The 
following section was obtained from the well at the Gas-works, in Green- 
ville : | 
Fr. IN. 
Sodcandty allow ela, seis ce trei oscar aie ey ay rctehe ae lee net ea nee a tener Pe ea ee 0 6 
TVG Cell ay aL sete etevess CO see wea tere ale (fs ANN Ok a GAA Err iy Se IN tad cee tye Na 1 6 
Yellow, elayznwithipebblessancdsbowldersmeaeeee sees eaten eee cera 8 0 
Yellow sand, stratified ...............-.. Phere eos odd ET SR Ie oa 8 0 
Hard-pan ....-- NATE ER AEE et ETS Ie ae ee Hee Notes AeA Haart Coce naa 1 6 
Rinel blue: clay. avery, tenactons——Suralitled) sje se ese soelsiieieels eee eee ee 0 8 
SIDS SENG! BING UNE Ce keno een eaodbe ysiiNon dddgced Cee eR ae Pah AD 
otalidep ths cea Neth Se Mes eee Ne aya me eae obs rave tut cea netetr et Ste ana 42 0 
The beds all appeared partially stratified, while the pebbles and bowl- 
ders were much water-worn. The thin layer of tenacious blue clay is 
undoubtedly that derived from melting icebergs, the running streams of 
which would naturally result in the stratification of the fine material. 
The surface bowlders consisted chiefly of greenstone, syenite, diorite, 
etc.; whilst in No. 3, we found many worn bowlders of water-lime and 
Niagara limestone. One small glacial bowlder was taken up from No. 7. 
Cyathophylloid corals, and several other of the ordinary Drift fossils, 
were common, 
From numerous other wells, of a greater or less depth, the following 
typical section might be noted: 
IN. FT. 
Sodio Lo ain 2 c.s Bese eae ata ccc ey CPA 0A ye ca eR a From6 to 14 
TROON CTY e Sete Oe RIAN NEE aS erator ttc a A earner ete pests ly Bowe De sifayie it! as 
Mellowaclayar acne aeneee AA ee Ua acs Ae ered tee eee B8cho Sob Ge CON KO NS 
Yellow, sandtanderaviel ss vases sees i ee yee cs separate rete enateta siete 6 to 20 
Biluersandiamdsoraye licen ieee mcrae iat erste seer witgaers eke ets PE sh ane) AXO) 
