216 Proceedings of Indiana Academy of Science 
where found at a higher elevation. If present this fault would extend 
almost parallel with the north line of section 22 dying out to the west 
before the northwest corner of section 22 is reached. This fault may be 
the cause of the two structural highs with a saddle between. The 
presence of this fault and its extent to the east has not been verified 
but is strongly suggested by the records of the wells in this area. 
Indications also point to a fault limiting the field on the north thru 
the center of section 9-4S-2W with an east-west trend. The upthrow 
side of this fault would be to the south. This fault is strongly sug- 
gested by wells near the center of section 9. The Humble Oil and 
Refining Company found a typical Hewitt section in their Hewitt- 
Walker No. 2, which is producing from sands found at 1,390 feet and 
below while just across the line to the north Merrick, et al, in their 
Lowery No. 1 and the Hewitt-Walker No. 1 of the Humble Oil and Re- 
fining Company drilled to depths greater than 1,800 feet, and found 
nothing but red beds and water sands. The fact that the Hewitt sands 
were not found in these two north wells makes it almost certain that 
a fault with an east-west trend exists. ’ 
Future drilling will be necessary to prove the presence and extent 
of these two faults. However the writer believes that they exist and 
will have an important bearing on the limits of the field to the north 
and northeast. 
The Hewitt anticline is very steeply folded. The formations dip 
west, southwest and south from the crest of the anticline at the rate 
of 1,200 to the mile. As mentioned above the east and north dips have 
not been fully established. The producing formations are more steeply 
folded in the Hewitt field than in any other producing field in Oklahoma 
with the possible exception of the southeast extension of the Healdton 
field where dips equally as steep in the producing sand have been ob- 
served by J. G. Bartram and the writer (Fig. 1, p. 472, Bull. Am. Assoc. 
of Petroleum Geologists. Vol. 5). 
The Hewitt sands are of Pennsylvanian age, probably the Glenn 
formation, and are believed to have been deposited over and around a 
core of older rocks as is the case with the Healdton sands and were 
folded with the older rocks before the Permian was laid down and pos- 
sibly again slightly folded after the deposition of the Permian. To 
date the Pennsylvanian has not been penetrated and the older formations 
discovered or at least they have not been identified. The Pennsylvanian 
is at least 2,000 to 2,100 feet thick at Hewitt. 
A small part of the dip on the structure may possibly be due to 
settling and sagging of the Pennsylvanian sediments about a core of 
older rocks. The structure is due primarily to deformative movements 
after the deposition of the Pennsylvanian. This is shown by the steep 
dips of the Pennsylvanian producing sands and the angular unconform- 
ity beneath the Permian. 
Source of the Oil. 
The oil of the Hewitt field and also of the Healdton field has come 
from either the Pennsylvanian shales and limestones and the asphaltic 
sands near the base of the Pennsylvanian, or from the Caney shales of 
