36 
OIL FIELDS OF TEXAS-LOUISIANA COASTAL PLAIN, [bull. 212. 
above the general level of the surrounding prairie and about 140 feet 
above sea level. 
The approximate area of this mound is 2,500 bo 3,000 acres, 
having a somewhat regular oval outline. Its longer axis lies in a 
general northeast-southwest direction. Viewed from the top of the 
highest point the surface appears as if the whole mound has been 
made up of a series of smaller mounds grouped around a central one, 
and the whole so intimately connected as to give the appearance of 
Fig. 1.— Sketch contour map of Damon Mound; by A. C. Veateh. 
one extended hill. The form of its surface is in part due to erosion, 
but the peculiar geologic structure of the mound suggests that these 
irregularities may be in part constructional. The presence of exten- 
sive deposits of salt shown in the Herndon well and its absence in 
other wells in the immediate vicinity, together with the occurrence of 
sulphur and the structure of the mound so far as it can be made out, 
suggest a close similarity with the Salt Islands of Louisiana. 
The greater portion of this mound is covered with blue and red 
clays. On the western slope brown sandy clays and shaly clays 
