STATE GEOLOGIST. 7 59 
Wells Drilled.—The wells drilled in the county from 1891 to 1899 
have been as follows: 
Producers. Dry. Totals. 
US Oar oppo instants cela sucude a, seuss, S516 530 92 622 
SDM awn seer sre lercte tate srakentr srestia oe sies 655 17 732 
IU) bd Gog Sibdd HOD Baan gh OOoe eG 663 97 760 
IPSS 8, 0 fo. 8 ee RE One EES a Ea ch tC ONC 746 139 885 
UH “ab Bho Gos oObo moon US Oe UR OOD ON Oe 347 40 387 
IUSEIG Nad BS SOO GO COO DOC GOS OD Doe OOO S 1,411 181 1,592 
ESO imperpeereysuetaveie iets oo eiorsce oiorensie-s/ ies 677 114 791 
UUs Ne) “6S G 6.0ib Sih pO Clots APRS 746 91 837 
SOO Raia sie Bese baie) SPT fokcieie tet Sane chore ohahede 976 79 1,055 
ANG UEWISAe Smiraccla cana MI AeO eC OO 6,751 910 7,661 
This shows that 88 per cent. of the wells were producers and 12 per 
cent. failures. 
GEOLOGY OF THE COUNTY. 
The surface of Wood county is either flat or gently rolling. It com- 
prises part of the territory formerly known as the black swamp, a large 
tract now constituting one of the richest parts of the state, whether con- 
sidered from an agricultural standpoint or from that of underground 
wealth. The surface rocks are the Lower Helderberg over the greater 
portion of the county, but near the central part and along the southern and 
southeastern borders the Niagara is found. The succession of strata 
below the surface is shown by the following record of a well at Bowling 
Green.! 
Feet 
IDV SURE 6-278 Chol ceckice y CGR CA HR SN PRON CL MOOT Pits rE a era oes 8 
INT Sara IME S COME ay cae ssy cele tec rore-c) cero Ho) Oial oteberebauel Oye euevoue ye 162 
rnin or ealkae éSTaleS)isnesaciste ce eect aia nie amt aie chee Selene es 
PS] pine SO MC haita cae vapuedcee une bers walsede aibrcrch chord Aule Se alae 5 
Niagara and Clinton limestone and shales............. 108 
Meciniaesh ales Greil ieee. < cy. tec cis abe cess Gels al oereiels tele ere 47 
Cincinnati (Hudson River) shales, blue with thin 
Shee tsmommelimestomeney taney em ik eee Sere 462 
Witicasshalesim (DROW) atacrise seit ers eure abe ie eee olen 300 
ME MCOMe TT ESTOM CHA la sania cieeers cess) oocusks ate cue eialeinin sue ovens 1,092 
Botcvomec twee lla cynics 21. Gale sel eee cia eee cca teas 1,648 
The sharp fold in the Trenton limestone found in this county has 
already been reported by Dr. Orton. It is conspicuous as far north at 
least as Bowling Green, but in the northern part of the county flattens, 
not being conspicuous thereafter. The size of this fold is well illustrated 
by the following data: 
Plain township, section 36, southwest quarter; Trenton at 1,090 pee 
400 feet west of this the same formation was struck at 1,306 feet, a drop 
of 216 feet. On the east line of this section the Trenton was found at 1090 
1Geol. Sur. of Ohio, Vol. VI, p. 112. 
