214 Proceedings of Indiana Academy of Science 
been drilled to sufficient depth to reach the lower member, unless the 
producing zone is Glenn, which is now believed to be the case. 
Unconformity Below the Pennsylvanian.—So far as known the 
unconformity below the Pennsylvanian has not been reached by any wells 
drilled in the Hewitt field. The writer believes that old buried hills of 
rocks older than the Pennsylvanian exist beneath the Hewitt field as 
in the Healdton field (Unpublished data on Healdton Oil Field by J. 
G. Bartram and Louis Roark). Old limestone hills similar to the Criner 
Hills, twelve miles southeast of the Hewitt field, exist beneath the 
Healdton field and it is believed that a similar condition exists in the 
Hewitt field except that such hills are more deeply buried than in the 
Healdton field, where the older formations are found as shallow as 800 
feet in some parts of the field. Deep drilling in the heart of the Hewitt 
field will eventually penetrate these old limestones making up the buried 
Hewitt hills. The rocks in these buried hills are believed to be sharply 
folded with the Pennsylvanian resting unconformably on the steeply 
dipping eroded edges of the earlier rocks. This is the condition in the 
Criner Hills southeast of Hewitt where the Pennsylvanian overlaps the 
earlier formations and in the Healdton field northwest of Hewitt. 
Older Formations——The formations older than the Pennsylvanian 
have not been identified in the Hewitt field and therefore will not be 
discussed here. These older formations have been fully described from 
a study of exposures at their outcrop in the Arbuckle Mountains, about 
12 miles northeast of the Hewitt field, by J. A. Taff in U. S. G. S. Prof. 
Paper No. 31. (Geology of the Arbuckle and Wichita Mountains.) 
Structure of the Permian. 
There is a slight folding of the Permian in this area, giving a 
small anticlinal doming of the surface formations. The highest portion 
of this dome is near the section corner of sections 21, 22, 27 and 28, 
Township 4 South, Range 2 West. The Permian structure is probably 
due to a slight deformative movement after the deposition of the 
Permian. A small part of the Permian structure may be due to sagging 
and settling of the Permian. 
This surface structure is a flat dome-like fold with dips of 30 to 
40 feet to the mile. The discovery well of the field was drilled by the 
Texas Company on their A. E. Denny lease, known as Denny No. 1 well, 
and is located in the northeast corner of the northwest quarter of the 
northwest quarter of section 27, Township 4 South, Range 2 West and 
was well located on the surface structure for a favorable test. Due 
to the unconformity between the Permian and Pennsylvanian formations 
the discovery well was near the south edge of the field as well No. 2 
on the same lease drilled by the Texas Company 1,600 feet south of 
No. 1 was a dry hole 2,126 feet. The writer believes that this No. 2 
well should have been drilled to 2,250 or 2,300 feet before being con- 
demned as a dry hole. 
Structure of Pennsylwanian. 
In studying the Pennsylvanian structure of the Hewitt field nine 
cross-sections were plotted on tracing linen. The oil sands were used 
