Bulletin of the United States Geological Survey--Oil Fields of the Texas-Louisiana Gulf Coastal Plain . northernside of Brazoria County. The first two are comparatively low, andmight probably be overlooked by the traveler. Damon Mound (seefig. 1), however, is a very prominent feature. Situated on the north-ern side of Brazoria County, on the Darst league, it forms a veryprominent feature in the landscape. For at least 20 miles in anydirection the surrounding country is a low, level prairie. The mounditself rises somewhat abruptly to an approximate height of 83 feet 36 OIL FIELDS OF TEXAS-LOUIS
Bulletin of the United States Geological Survey--Oil Fields of the Texas-Louisiana Gulf Coastal Plain . northernside of Brazoria County. The first two are comparatively low, andmight probably be overlooked by the traveler. Damon Mound (seefig. 1), however, is a very prominent feature. Situated on the north-ern side of Brazoria County, on the Darst league, it forms a veryprominent feature in the landscape. For at least 20 miles in anydirection the surrounding country is a low, level prairie. The mounditself rises somewhat abruptly to an approximate height of 83 feet 36 OIL FIELDS OF TEXAS-LOUISIANA COASTAL PLAIN, [ above the general level of the surrounding prairie and about 140 feetabove 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 ageneral northeast-southwest direction. Viewed from the top of thehighest point the surface appears as if the whole mound has beenmade 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 theseirregularities may be in part constructional. The presence of exten-sive deposits of salt shown in the Herndon well and its absence inother wells in the immediate vicinity, together with the occurrence ofsulphur 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 redclays. On the western slope brown sandy clays and shaly clays HAYES ANDKfcNNEDY. DETAILED SECTIONS. 37 appear on the surface. Several small veins or seams of sulphur, evi-dently deposited by escaping- gases, fill cavities in the sand}T clays,and considerable quantities of the same mineral occur in
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