186 ANNUAL REPORT 
ae top at 400 feet 
Oa =e Goehese, rag eer aie tnoh ok opera ; bottom at 40244 feet 
ein top at 1,200 feet 
| alts-Sandncsetesac eee oe bottom at 1,280 feet 
top at 1,450 feet 
Maxtoni ieee cca aries 
bottom at 1,500 feet 
top at 1,510 feet 
bottom at 1,545 feet 
. ( top at 1,560 feet 
EMEP SEWN! Soecoocucccce 1 bottom at 1,615 feet 
top at 1,615 feet 
Big Injun and Squaw sand} }ottom at 1,730 feet 
top at 2,124 feet 
bottom at 2,138 feet. 
Bereaesalldmerrne reer } 
Other records provided the Survey by the same operator duplicate 
the one given, so that this may be regarded normal for the territory. The 
section contains several formations new to this report, and these will be 
reviewed here in order that what follows may be more clearly understood. 
The great “key rock” by which the driller determines his position 
stratigraphically in this part of the field is the Mountain limestone, or the 
“Big lime” as it is commonly called. Its thickness in this pool commonly 
ranges from 35 to 50 feet.. Westward it thins and does not appear at all 
in the Marietta and Macksburg sections. The farthest point west at which 
the writer found it reported is at Fifteen P. O. in section 7 of Liberty 
township, where it ranges in thickness from 0 to 20 feet. East from this 
place it is always present, making a datum plane of unusual value to the 
driller. 
Resting either directly on this or separated from it by a few feet of 
shales is frequently found a sand rock which produces some oil, and is 
called the Maxton. 
Immediately below the “Big lime” is a series of sandstones and shales 
known collectively as the Big Injun in which large quantities of oil are 
found in several pools. Occasionally, however, the formation consists 
of an unbroken sandrock from top to bottom. The upper part of the for- 
mation when separated from the lower by a few feet of shales is known 
as the Keener sand, named from the Keener farm near Sistersville, West 
Virginia. The succession there according to Professor White is as 
follows: 
Big Lime (Mountain). 
Big Injun < “Break” (slate)........ 16 & 125 feet. 
