. Bulletin of the Geological Society of America. Geology. RELATIONS OF THE OILS TO STRUCTURE 64S certain conditions in joints, etcetera, o f metamorphic rocks where overlain by oil- bearing sediments. The greater number of the reservoir forms listed are. too well known to re- quire further explanation. Among the irregular lenses of depositional origin i s mentioned "originally warped" beds. These are beds which, like the lower gas-bearing layers of the Potsdam, were deposited as somewhat uniform mantles over underlying unconform- able surfaces and possess original curvatures similar
. Bulletin of the Geological Society of America. Geology. RELATIONS OF THE OILS TO STRUCTURE 64S certain conditions in joints, etcetera, o f metamorphic rocks where overlain by oil- bearing sediments. The greater number of the reservoir forms listed are. too well known to re- quire further explanation. Among the irregular lenses of depositional origin i s mentioned "originally warped" beds. These are beds which, like the lower gas-bearing layers of the Potsdam, were deposited as somewhat uniform mantles over underlying unconform- able surfaces and possess original curvatures similar to those elsewhere formed by folding. Fossil bars, spits, and allied deposits are more frequent than is usually imagined. Current deposits filling channels in older or in contemporaneous beds are by no means uncommon. They are almost invariably coarser than the surround- ing material, even conglom- eratic. CONFINING AGENCIES These are likewise of -great importance, since fa- vorable structures and ade- quate reservoirs will be un- availing in the absence of agents capable of effecting the retention of the oil. The. Line. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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