662 GEOLOGY OF OHIO. 
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safely estimated to be not less than six hundred and fifty feet above 
Cincinnati, or eleven hundred feet above the sea. There is but little 
difference in the elevations of these dividing ridges. The summits of 
each consist of stratified beds of sand and gravel belonging to the 
‘latest stage of the Drift period. The highest elevation held by the 
bedded rock is probably in Miami township, to the north and north-west 
of Yellow Springs. 
The elevations of a few of the principal points in the county are here 
appended, almost all of which were determined for the Survey by Frank- 
lin C. Hill, Esq., of Yellow Springs. All are counted above low water at 
Cincinnati : 
Feet. 
Xenia woTadelot railroad ‘atid CpOueunccsneeecsene tes eee eee eee aerate ee A491 
Vellowisprungserade of railrosdvatidepot renee esncece eee ceeteene b41 
Osborne, i. SSAA chaste ac ea eee aE L Sac abode rons Meee 410 
Spring Valley, " FMM PR trina ee My Actrnt es cadonock 833 
Claysville, ‘ CS ROL Rea cine Os ae 321 
Harbine’s Station, oy Ce hyo Nee ARIS ies TUS, Sima Batu edet cect 370 
Oldtown, + RE ESR ROSE Pema Mn Hin ASO AS Cogosa Abaods 396 
Goe’s Station, és FE os at Liss ag PRE Sn ie A ee 497 
Berryhill’s Hill, Spring Valley township (outlier of cliff limestone)........ 560 
Shoup’s quarry, two miles south-west of Harbine’s (outlier of cliff lime- 
TIC) 0X2 Ja Ear Aneta? ny IRN SONAL SACI TE RSs Oe alc iscsicGoon 519 
Gravelibank; Yellow. Springs aboutioccccsccccosccomeetenetnicccecetinencee tee taens 625 ate 
Railroad grade, one mile north of Yellow Springs (north line of county), 
BOOUG a ee iaceojebeodccestsecseumie wacciomaeietane cise te ccdenimacemanee seine meas nent eentaene aes 600 
Cedarville \(railroad’grade), albouticc.sse-eetescccceeeetecsereeese niececcne tetera: 550 
Low water at Cincinnati is four hundred and thirty-two feet above the 
sea. By adding, therefore, four hundred and thirty-two leet to each of 
these elevations, the level above the sea is obtained. 
II. GEOLOGICAL SERIES. 
The geological scale of Greene county is identical with that of Mont- 
gomery and Clarke counties, already reported upon. Its rock formations 
are confined to two great series, viz., those of Upper and Lower Silurian 
age; and between them the surface of the county is almost equally di- 
vided, as is shown on the appended map. 
A vertical section of the rocks of the county would be found to contain 
the following elements : | 
3. Niagara Group. : \ 
2. Clinton Limestone. 
1. Cincinnati Series, Lebanon division. 
The lowest division has an aggregate thickness of two hundred and 
fifty feet, the middle division of fifty feet, and the uppermost of one 
