Memoirs of the Geological Survey of Great Britain, and of the Museum of Practical Geology in London Volume 1 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1846 Excerpt: ...0 6. Dark shales, abounding with small crystals of selenite; iron pyrites in irregular bands (fossiliferous).... Lias. "' Sandstone, commonly micaceous; often irregularly marked in plates (with occasional argillaceous partings) of one set of current or ripple marks above each other. Exhibits a variety of markings, like the bottom of a sandy and shallow sea. Full of Jish teeth and scales, with occasional patches of copro-lites, distributed as at the bottom of a sea.. 8. Dark shales, with iron pyrites; contain bones of Saurians, Jish teeth, &c 9. Band of sandstone; fish teeth occasionally seen in it 10. Dark shales, with patches of iron pyrites, mingled with Saurian bones and teeth, fish bones, scales, and teeth, Coprolites, &c. 11. Rubbly blue marl 12 12. Alternating blue and red marls, the former predominating upwards......... 13. Red marls 14. Gray arenaceous beds, argillaceous shales, and blue argillo-arenaceous beds (fossiliferous)..... 15. Red marls, with an occasional band of sandstone. At Newnham the cliff affords a section of certain beds among the red So termed from the bright golden appearance of the iron pyrites found in the lias. marls which can be traced, with some intermediate breaks, for a considerable distance northward, occasionally containing organic remains, fish teeth, palates, and defensive fin bones, with bivalve shells, and marking a state of things, for a time, favourable to the existence of animal life, amid a series of deposits not so characterised. These beds most frequently consist, though often modified, of gray sandstones and shales, with traces of calcareous matter. The maps of the Survey will show the course of these beds northward, a separate colour having been assigned to them, and the complicated form they assu...