. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 518. DUNKAROS CR BRAOYS BEND OIL CR. Fig. 519. three principal oil-horizons of the United States, viz., the Venango County (Pennsylvania) horizon with its three sandstones; theVirginia sub-Carboniferous horizon above ; and the Canada horizon below. Petroleum (especially the lighter oils) is usually found only in hori- zontal or gently-folded strata, because strongly-folded and crumpled strata are always metamorphic, and the heat which produced meta- morphism has also concreted the oil into bitumen or asp
. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 518. DUNKAROS CR BRAOYS BEND OIL CR. Fig. 519. three principal oil-horizons of the United States, viz., the Venango County (Pennsylvania) horizon with its three sandstones; theVirginia sub-Carboniferous horizon above ; and the Canada horizon below. Petroleum (especially the lighter oils) is usually found only in hori- zontal or gently-folded strata, because strongly-folded and crumpled strata are always metamorphic, and the heat which produced meta- morphism has also concreted the oil into bitumen or asphalt. Also the outcropping of the edges of highly-inclined strata favors the escape of. 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 LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
