STATE GEOLOGIST. 21 
The following skeleton record of a well on the Spire farm, near 
Sugar Grove, shows the position of the Medina as well as the Clinton: 
Feet 
ED PIE Pr pas ora ede 8 tA a AR UO aya OG Sor RCE RE et i as ial 
BERGA ort e DOECOING Ati Sak cherie oleToteuaicva less oleiet tis ioue Sieiercts 460 
Corniferous, Helderberg, top at 1,235 
and: Niagara limestones... i. .....6 050... bottom at 1,921 
: top at 2,025 
s Clinton sand e@eooe?e @eeooee?e? @eeeev 0000808080808 20808 @ ; bottom at 2,045 
Meditvar(redssitales )MtOpeat.-c8 to cis cnelsss s)6 eel sioze stSuetere levees a's 2,055 
IB OULGINEO Ce Welleabwrcthsrs berries cr occ anea ech otelaia gia Melee a ertues 2,075 
This makes the red shales, lying from 10 to 30 feet below the 
Clinton sand, the top of the Medina. 
The Lower Helderberg.—Rocks of this age produce gas and oil in 
one locality, viz., near Jefferson, Ashtabula county. The succession of 
strata there is shown by the following record of Webb Well No. 1. All 
measurements were made with a steel line. 
Thickness of Total 
formation. depth. 
ESR ee Feet. Feet. 
DIE Geeta ney en ie eee: aigesie tet erecelele ee theo eee 33 33 
OMVOR SACS cease eee ee ie oj uvele Ss veo niece ales 1,671 . 1;704 
Corniferous and Lower Helderberg lime- ; 
SHOES Goososer Sa (eran ci tas em a Peete: 289) 7 = 71,992 
Gas;sand at ........-. Be EE pe eel eg, SE LNES 1,992 
The sand, which is from 30 to 40 feet in thickness, is interbedded 
in the Lower Helderberg’ Hiésténe.° “Similar conditions are found in 
Lucas.and Wood counties,,in the. former of. which,the sand has been 
quarried for the manufacture of glass.!_ In the gas field under consider- 
ation the sand is moderately coarse, has a light color, and is highly fossil- 
iferous. The gas is found in the top of the formation, and just below lies 
a large and threatening. reservoir of salt-water. A number of towns and 
villages are being supplied with fuel from this field. The oil wells are 
few in number and insignificant in production. 
THE DEVONIAN. 
The rocks of this age, found in Ohio, have been classified by 
Orton? as follows: 
Feet. 
See ONIO aShialesiyNectars, chelsscvene SLOSS CE RRL SE 250—3,000. . 
2m OLEMGATIE Vin SIVA Greeti eco seen re wiake ee at blots 25 
1. Devonian limestone (Corniferous)....... tous 15 
1Geol. Survey of Ohio, Vol. VII, p. 17. 
2Ibid., pp. 4 and 18-26. 
