. Cassier's magazine . FIG. 5. OIL IN ROCK WHICH SLANTS IN ONLY ONE DIRECTION (MONOCLINE) PETROLEUM ACCUMULATIONS 603. OIL ASSOCIATED WITH FAULTS The rock was folded, broke, and that to the right slid upward along the line F-L. The rock adjacentto F-L was broken, and oil, rising up F-L, was caught in open spaces between the crushed rocks. movement finds lodgement in thesepockets, where it comes to rest. It readily can be seen that it isimpossible to ascertain the locationof these pockets containing the oil,save by actual drilling. Where onewell might strike oil, another only afew yards away wo
. Cassier's magazine . FIG. 5. OIL IN ROCK WHICH SLANTS IN ONLY ONE DIRECTION (MONOCLINE) PETROLEUM ACCUMULATIONS 603. OIL ASSOCIATED WITH FAULTS The rock was folded, broke, and that to the right slid upward along the line F-L. The rock adjacentto F-L was broken, and oil, rising up F-L, was caught in open spaces between the crushed rocks. movement finds lodgement in thesepockets, where it comes to rest. It readily can be seen that it isimpossible to ascertain the locationof these pockets containing the oil,save by actual drilling. Where onewell might strike oil, another only afew yards away would stand a fairchance of missing the oil-rock en-tirely, and even if porous rock werestruck it would not necessarily con-tain oil. PECULIAR MOUND STRUCTURE A striking peculiarity of the Gulffield are the low mounds, of whichthe celebrated Spindletop is a goodexample. This mound is but 10 feetabove the adjacent prairie, and, inarea, little more than 200 structure of the strata in thesemounds is probably that of a lensof dolomitic limestone, concave be-low and convex above, the sidesthinning out and gr
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyork, booksubjec