STATE GEOLOGIST. 119 
| gen 238 
Character of Formation. ie Shs 4 gas 
Sov Bode? 
ra o> BH 
a A 
( Black Slatemsie tows cs 60 960 
WWI “SIEWO “Géecionocc0 355 1,315 
IBHOMWia:. SBA soooucucod 295 1,610 
Ohio shales..... + Wilh temeSla tency sisstsc sero: s 110 ney erAl) 
Browneslatemrmerrmc crock 15 1,735 
| Wilhnitemslaten cris snes « 165 1,900 
i SIACQrR eet 160 2,060 
; ( Top of Corniferous lime- 
ae SULON CMA tetarciewe eicwenedareelers.2 8 state 2,060 
ower Helder- i 
berg and Niag- | Break in limestone at.. .... 2,500 
TA ec werent fez. 4 Bottom of break at...... ae 2,560 
| Bottom of limestone at.. .... 2,950 
2,810 feet of 5 3-16 inch 
casing. 
( UC URE TOC Keteeran crete car toate yas 40 2,990 
Blue slave ane Benue 95 3,085 
CHIMOM 65565666606 Clinton sand stone at..... .... 3,085 
| Bottom of well, still in 
L (QIHTKONN ~~ 4 oG00b08d00 seine 3,100 
The most interesting point about this section relates to the Ohio 
shales. These were struck at a depth of 900 feet, and the bottom was 
reached at 2,060 feet, showing a thickness of 1,160 feet for the formation. 
The record of the Federal well near Lancaster gives these shales a thick- 
ness of 702 feet. This is am increase of 458 feet in about 20 miles, or 23 
feet to the mile. The great limestones have a thickness in the Federal 
well of 687 feet, and this is about the average for the entire Sugar 
Grove field. In the Junction City well the thickness found is 890 feet, an 
increase of 203 feet or about ten to the mile. The deep well drilled at 
McConnellsville found the Ohio shales 1,712 feet thick. This point is 
42 miles east of the Federal well; hence the increase in thickness of the 
Ohio shales averages 24 feet to the mile. If this rate of increase continues 
eastward to the Ohio river the formation would reach 3,000 feet in thick- 
ness. This corresponds with what has already been demonstrated in 
Columbiana county. The importance of this feature in our geology can- 
not be over-estimated by the seeker for oil or gas. It demonstrates the 
folly of attempting to make the Clinton or Trenton formation a source 
of oil or gas in a commercial way in eastern Ohio. 
The following skeleton record of the McNichols well, twenty-five 
miles south of Sugar Grove in Jackson township, Vinton county, is of 
interest because it shows the thickness of both the Clinton and the Medina: 
1{t will be noted that these figures do not agree with those given on the ac- 
companying diagram. , The difference results from the Ohio shales alone being 
considered in the text, while in the diagram both the Bedford and Ohio shales 
are included. 
