Chemical And Geological Essays
Chemical And Geological Essays
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53. This formed a part of the report by Emmons on the Agriculture of New York, but waa also published separately.
Digitized by Google XIIL] GEOGNOSY OF THE APPALACHIANS. 253 lar quartz ; 2. Stockbridge limestone ; 3. Magneeian slate ; 4. Sparry limestone; 5. Roofing-slate, graptolitic; 6. Sili- cious conglomerate; 7. Taconic slate; 8. Black slate. The apparent order of superposition differs from this, and it was conceived by Professor Emmons that during the accumulation of these Taconic rocks, ...the Green Mountain gneiss, which formed the eastern border of the basin, was gradually elevated so as to bring successively the older members above the ocean from which the sediments were being deposited. From this it resulted that the upper members of the system, such as the black slates, were confined to a very narrow belt, and never extended fur eastward ; although he admits that denudation may have removed large portions of these upper beds. At a subsequent period, a series of parallel faults, with upthrows on the eastern side, is supposed to have broken the strata, given them an eastward dip, and caused the newer beds to pass suc- cessively beneath the older ones, thus producing an apparently inverted succession, and making their present seeming order of superposition completely deceptive.
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You can find similar books in the "Read Also" column, or choose other free books by Thomas Sterry Hunt to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
53. This formed a part of the report by Emmons on the Agriculture of New York, but waa also published separately.
Digitized by Google XIIL] GEOGNOSY OF THE APPALACHIANS. 253 lar quartz ; 2. Stockbridge limestone ; 3. Magneeian slate ; 4. Sparry limestone; 5. Roofing-slate, graptolitic; 6. Sili- cious conglomerate; 7. Taconic slate; 8. Black slate. The apparent order of superposition differs from this, and it was conceived by Professor Emmons that during the accumulation of these Taconic rocks, ...the Green Mountain gneiss, which formed the eastern border of the basin, was gradually elevated so as to bring successively the older members above the ocean from which the sediments were being deposited. From this it resulted that the upper members of the system, such as the black slates, were confined to a very narrow belt, and never extended fur eastward ; although he admits that denudation may have removed large portions of these upper beds. At a subsequent period, a series of parallel faults, with upthrows on the eastern side, is supposed to have broken the strata, given them an eastward dip, and caused the newer beds to pass suc- cessively beneath the older ones, thus producing an apparently inverted succession, and making their present seeming order of superposition completely deceptive.
What to read after Chemical And Geological Essays?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Sterry Hunt to read onlineMoreLess
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