. Annals of the New York Academy of Sciences. Science. 43 Geology of Hudson County, New Jersey. The open fissure at Arlington, which is without doubt filled below with trap, and other thin sheets of the same rock pene- trating the sandstone in the Schuyler mine, also nid us in un- derstanding the genesis of the Triassic trap-rocks. Grouping all these phenomena together, we are enabled to construct an ideal trap-sheet, as it would appear while yet in- closed in the stratified rocks among which it was intruded, or before it was exposed by denudation. A cross-section of such an ideal trap-sheet i
. Annals of the New York Academy of Sciences. Science. 43 Geology of Hudson County, New Jersey. The open fissure at Arlington, which is without doubt filled below with trap, and other thin sheets of the same rock pene- trating the sandstone in the Schuyler mine, also nid us in un- derstanding the genesis of the Triassic trap-rocks. Grouping all these phenomena together, we are enabled to construct an ideal trap-sheet, as it would appear while yet in- closed in the stratified rocks among which it was intruded, or before it was exposed by denudation. A cross-section of such an ideal trap-sheet is shown in the following diagram, Avhich repre- sents a main intrusion of trap like that forming the Palisades or the First Newark Mountain, with its branching or secondary sheets and dikes. Fig. 3.—Ideal Section of Trap-Sheet. c w %. ] S. E. If denudation should have removed the material to the right of the line C, D,—an exposure would be made similar to that now seen in the cliffs at Weehawken. Were the rocks above the dotted line E, F, G, removed, the trap-sheet at i^ would protrude and form a hill, like Snake Hill and Little Snake Hill, while the sheet E, when denuded and rounded off, Avould correspond with the Ioav ridge of trap along the west- ern border of Bergen Hill. In the same manner, if the acci- dents of erosion should expose the rocks along the line A, B, the conditions now shown at Plainfield and Bound Brook would result. The Arlino-ton fissure is indicated at 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 New York Academy of Sciences. New York, New York Academy of Sciences
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
