Explanatory Notes to Accompany a New Geological Map of England And Wales
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In our eReader you can find the full English version of the book. Read Explanatory Notes to Accompany a New Geological Map of England And Wales 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 Explanatory Notes to Accompany a New Geological Map of England And Wales
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The Cambrian system consists mainly of mechanical sedi- ments, which in the lower part are somewhat coarse in texture, forming grits and conglomerates, but which pass upward into finer sandstones and shales or slates. It is usually grouped in three divisions, each distinguished by a characteristic form of trilobite. The lowest or Olenellus series has been determined by Professor Lapworth to occur in the Shropshire area, where it consists of thin quartzite passing up into flags, grits, shales, a...nd sandstones, and where it has yielded the characteristic Olenellus. . In that region it is overlain with conglomerates and limestones containing Paradoxides, forming the Middle Cambrian group. The Upper group, composed of the Shineton shales, has afforded specimens of Olenus, Dictyograptus, &c. The total thickness of these three groups in the Shropshire region is estimated at about 3000 feet. In Wales, however, the system attains considerably greater dimensions, reaching perhaps to 12, 000 feet or more.
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To quickly assess the difficulty of the text, read a short excerpt:
The Cambrian system consists mainly of mechanical sedi- ments, which in the lower part are somewhat coarse in texture, forming grits and conglomerates, but which pass upward into finer sandstones and shales or slates. It is usually grouped in three divisions, each distinguished by a characteristic form of trilobite. The lowest or Olenellus series has been determined by Professor Lapworth to occur in the Shropshire area, where it consists of thin quartzite passing up into flags, grits, shales, a...nd sandstones, and where it has yielded the characteristic Olenellus. . In that region it is overlain with conglomerates and limestones containing Paradoxides, forming the Middle Cambrian group. The Upper group, composed of the Shineton shales, has afforded specimens of Olenus, Dictyograptus, &c. The total thickness of these three groups in the Shropshire region is estimated at about 3000 feet. In Wales, however, the system attains considerably greater dimensions, reaching perhaps to 12, 000 feet or more.
What to read after Explanatory Notes to Accompany a New Geological Map of England And Wales?
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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