. Bulletin of the Geological Society of America. Geology. 570 F. G. CLAPP CLASSIFICATION OP PETROLEUM AND GAS FIELDS to the productive areas, whether the internal character changed in any way so as to make it incapable of holding oil, whether the sand disap- peared on the borders of the pools, or whether the areas of productivity were independent of these features. During the first field-work done in regions of monoclinal dip, many years ago, data were obtained which subsequent evidence in many fields has not refuted^that is, data indicating that the gas, oil, water, and drv. Figure 9.—Map ill
. Bulletin of the Geological Society of America. Geology. 570 F. G. CLAPP CLASSIFICATION OP PETROLEUM AND GAS FIELDS to the productive areas, whether the internal character changed in any way so as to make it incapable of holding oil, whether the sand disap- peared on the borders of the pools, or whether the areas of productivity were independent of these features. During the first field-work done in regions of monoclinal dip, many years ago, data were obtained which subsequent evidence in many fields has not refuted^that is, data indicating that the gas, oil, water, and drv. Figure 9.—Map illustrating the Occurrence of Petroleum on structural Terraces, in southeastern Ohio, according to Subclass III (c) After Griswold and Munn. For explanations see figures 3 and 8. Contour interval, 10 feet areas in a persistent sand horizon are, as a rule, independent in theii' general distribution of the character or thickness of the sand. Some dry holes are found, even in the center of the best pools, due to the thinning out or hardening of the sand locally, and holes having sand of these char- acteristics exist also in extensive dry areas; but among the hundreds of dry holes drilled to the Clinton sand east of the main gas belt in Ohio the great majority contain sand to all appearance as suitable in texture and thickness as most of the sand in which oil and gas are found. This. 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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