puller.] ASPHALT, OIL, AND GAS IN SOUTHWEST INDIANA. 335 
The anticlinal swell northwest of Glezen is a broad, low swell, the 
crest of which may be considered as starting near Clark and as pass- 
ing sonthwestward about midway between Glezen and Rumble and 
through the group of coal strippings at the head of Robinson Creek, 
finally subsiding at a point a little to the east of Oatsville. The second 
swell mentioned is first noticeable at a point about a mile south of 
Winslow. The crest passes a mile south of Ayrshire and through 
Sophia and Turkey Hill. It subsides before reaching Oakland City. 
The swell near Arcadia appears to be a somewhat irregular dome, the 
highest point of which is probably a little west of town. The axis of 
the last of the swells mentioned as occurring southeast of Boonville is 
apparently located a little over a mile south of the railroad at this 
place, from which point it extends southeastward toward Midway. It 
has, however, been traced only as far as the alluvial flats. 
The change from flat to steep dips and vice versa are usually grad- 
ual and do not admit of very exact location. In general the dips are 
steeper east of a north-south line drawn through Oakland City, and 
are flatter from this line westward to the vicinity of Francisco, where 
they again appear to steepen. The minor irregularities, sometimes 
characterized by dips as high as 5° or 10°, are likely to be of more 
importance as regards the occurrence of oil and gas than some of the 
broader features, but they do not usually extend for more than a few 
hundred feet at the outside and their location can seldom be predicted. 
