THE SUNBURY SHALE OF OHIO 309 
taken in connection with the barometric section from the level 
of the Pymatuning Creek and the Sharon conglomerate, on the 
Troutman farm north of Orangeville, apparently show that in the 
vicinity of Orangeville there is an interval of about 300 feet 
between the base of the Sharon conglomerate and the top of the 
Berea grit. There is some uncertainty as to what should be con- 
sidered the base of the Berea grit. If the line is drawn at the 
top of the 3 feet of shale, reported at the depth of 122 feet, then 
the Berea will have a thickness of 80 feet. The sample, how- 
ever, from 122 to 164 feet is composed mainly of rather large 
pieces of quartz sand and is apparently from a massive sandstone. 
If this lower sandstone be classed in the Berea grit, then it will 
have a thickness of 122 feet. The well has been drilled toa 
depth of 1715 feet, and the deeper samples are mainly from blu- 
ish to grayish argillaceous shales, together with some from gray- 
ish arenaceous shales and thin grayish sandstones, apparently in 
the Erie shale. The samples showed no indication of the black 
Cleveland shale, so that it is impossible to give the base of the 
Bedford or top of the Erie shale in this record. 
An examination of Dr. Orton’s description of the well rec- 
ords of this region leads the writer to conclude that he referred 
all the sandstone at this horizon to the Berea grit. Dr. Orton 
reported the Berea grit ‘“‘to have a thickness of 100 feet, or even 
more’’? in the Mecca oil field to the northwest of Orangeville, 
in the northern central part of Trumbull county. In the wells 
near Youngstown, which is southwest of Orangeville, in the 
northern part of Mahoning county, it is given as from 150 to. 
160 feet thick ‘“‘ with a thin bed of shale interstratified about 
half way down.”* While still farther south in the East Liver- 
pool gas field, in the southeastern corner of Columbiana county, 
in the Ohio river valley, Dr. Orton stated that ‘‘the Berea grit 
ranges in this territory from 60 to 120 feet in thickness.” 3 From 
a well near Sharon, in the western part of Mercer county, Pa., 
about seven miles south of Orangeville, thegPennsylvania geolo- 
t Rep. Geol. Surv. Ohio, Vol. VI, p. 331. 
Tbid., pp. 402, 403. 3 [bid., p. 333. 
