STATE GEOLOGIST. 69 
GEOLOGY OF THE COUNTY. 
The surface rocks in the western and northern parts of the county are 
the Lower Helderberg limestone, and in the eastern part the Niagara. 
The succession of strata under ground is shown by the following record 
of a well at Findlay? 
Feet. 
IDIRURD I 3.S6 Shore dasa bos. ODEO Cs OO) Daciniton cn kane Sin earn 8 
Nasa aesiMTeS TONE eercy me cartereiats <ters-uoucrsesiciels sic, epene) sone 162 
SITS MNTESTO NM Creare scare cobeaiekorekeie coun cielo od wb cuceuobe: tiene euees 5 
Niagara and Clinton limestone and shale............. 108 
Mire dinates lal eee Cl ererersk Gans weeneu nisl ints citeiteccl sysveie soevevene. ee 47 
Cincinnati shales, blue with thin sheets of limestone.. 462 
WitiGamslial eS RO will creys cert otc ees ote toc iereibicle e eucueltieereys 300 
TR ETIUG OMMAUTINE SOM Cpe Groner seers cack Steten eso feiued ciisuaves suouehiciee te vayereeeriapeh © 1,092 
IBA, OF Well (ihn “MESON coogodscoobduodoboKOOS 1,648 
The position of the Trenton along an east-west line in the northern 
part of the county is shown by the following data: 
Pleasant Township, near McComb: drive pipe, 62 feet; casing, 630 
feet; Trenton at 1,412; elevation of well head, 730 feet above sea level. 
Portage Township, northwest quarter of section 10: drive pipe, 34 
feet ; casing, 409 feet; Trenton at 1,201 feet; elevation of well head about 
750 feet above sea level. 
Allen Township, west of Van Buren: Trenton at 1,232 feet; elevation 
of well head, 780 feet above sea level. 
Cass Township, southwest quarter of section 15: Trenton at 1,150 
Teet: 
Washington Township, near Arcadia: Trenton at approximately 1,200 
feet ; elevation of well head, 806 feet above sea level. 
These records indicate a gradual slope from the center of Cass 
township to the east and west. Just north of Van Buren, Allen township, 
the Trenton is found at 305 feet below sea level, this being probably its 
highest altitude in the northern part of Hancock county. Examination 
of the tier of townships lying south of that just given shows similar condi- 
tions. Wells drilled outside of the main pools show the same general 
succession of strata and depths as those previously given. In fact, the 
Trenton limestone in the producing portions of Hancock county lies 
nearly flat, the altitude varying but little from place to place. To this 
there is one noteworthy exception—the Findlay arch. This has already 
been fully described by Dr. Orton in Volume VI, and the First Annual 
Report (1890) and those who desire a detailed account must refer to those 
volumes.” Suffice it to state here that at Findlay a sharp bending of the 
strata is found, the result being that the Trenton drops to the west 150 
1Geol. Sur. of Ohio, Vol. VI, p. 112. 
2Ibid, pp. 120, 133-5 and First Ann. Rep. 1890, Plate II. 
