Outlines of Field Geology
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64) would settle FIG. 65. View of the Island of Staffa and Fingal's Cave, showing amorphous and columnar basalt resting upon tuff.
the question. These rocks consist of ejected volcanic detritus, and must have been laid down at the surface ; they could not be injected as in the case of crystalline rocks. 1 Whenever, therefore, we encounter interstratifi- cations of volcanic tuff in a group of sedimentary forma- tions, we are justified in regarding them as evidence of contemporaneous volcanic act...ivity. The observer should 1 Exceptional cases occur where the tuff that fills a volcanic vent has found its way into cracks in the walls of the funnel.
1 70 OUTLINES OF FIELD-GEOLOGY PARTI study carefully a good series of specimens of various tuffs from different geological formations, and learn to distin- guish them from mere mechanical detritus derived from the superficial disintegration of igneous rocks.
But the proof of former volcanic action is vastly strengthened when we find not only the consolidated ashes, but also the lava-streams of the period (/, /, Fig.
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You can find similar books in the "Read Also" column, or choose other free books by Archibald Geikie to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
64) would settle FIG. 65. View of the Island of Staffa and Fingal's Cave, showing amorphous and columnar basalt resting upon tuff.
the question. These rocks consist of ejected volcanic detritus, and must have been laid down at the surface ; they could not be injected as in the case of crystalline rocks. 1 Whenever, therefore, we encounter interstratifi- cations of volcanic tuff in a group of sedimentary forma- tions, we are justified in regarding them as evidence of contemporaneous volcanic act...ivity. The observer should 1 Exceptional cases occur where the tuff that fills a volcanic vent has found its way into cracks in the walls of the funnel.
1 70 OUTLINES OF FIELD-GEOLOGY PARTI study carefully a good series of specimens of various tuffs from different geological formations, and learn to distin- guish them from mere mechanical detritus derived from the superficial disintegration of igneous rocks.
But the proof of former volcanic action is vastly strengthened when we find not only the consolidated ashes, but also the lava-streams of the period (/, /, Fig.
What to read after Outlines of Field Geology?
You can find similar books in the "Read Also" column, or choose other free books by Archibald Geikie to read onlineMoreLess
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