Annals of the New York Academy of Sciences
Annals of the New York Academy of Sciences
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In our eReader you can find the full English version of the book. Read Annals of the New York Academy of Sciences Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Annals of the New York Academy of Sciences
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In describing the rocks referred to the Cambrian in his recapitulation of the Paleozoic, King^ says : **Thu8 far among the reported occurrences of the rocks of this horizon in the Ck>rdilleras, the locality at the mouth of Big Cottonwood Canyon must remain as the finest example and the stratlgraphlcal type. The lowest member — ^the Cottonwood slates, a group about 800 feet thick, which here rests upon highly metamorphic Archean schists — has thus far yielded no organic forms. The rocks are dark... blue, dark purple, dark olive green and blackish argillites, all highly silicious and as a group sharply defined from the light-colored quartzlte schists which conformably overlie them. This second group, by far the greatest of the whole Cambrian series, is a continuous zone of schists which have a prevailing quartzlte character, though varied with considerable amounts of argillaceous matter. From 8000 to 9000 feet thick, it has a general uniformity of lithologic condition from bottom to top.
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To quickly assess the difficulty of the text, read a short excerpt:
In describing the rocks referred to the Cambrian in his recapitulation of the Paleozoic, King^ says : **Thu8 far among the reported occurrences of the rocks of this horizon in the Ck>rdilleras, the locality at the mouth of Big Cottonwood Canyon must remain as the finest example and the stratlgraphlcal type. The lowest member — ^the Cottonwood slates, a group about 800 feet thick, which here rests upon highly metamorphic Archean schists — has thus far yielded no organic forms. The rocks are dark... blue, dark purple, dark olive green and blackish argillites, all highly silicious and as a group sharply defined from the light-colored quartzlte schists which conformably overlie them. This second group, by far the greatest of the whole Cambrian series, is a continuous zone of schists which have a prevailing quartzlte character, though varied with considerable amounts of argillaceous matter. From 8000 to 9000 feet thick, it has a general uniformity of lithologic condition from bottom to top.
What to read after Annals of the New York Academy of Sciences?
You can find similar books in the "Read Also" column, or choose other free books by New York Academy of Sciences to read onlineMoreLess
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