Proceedings of the Geological Society of London Volume 4 (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: ...blue clay, which the author refers to a great detritic accumulation called "till," and which occurs extensively over the northern portion of the county of Essex. The till varies considerably in character and composition; at the N. extremity of the section which the author exhibited, it was described as consisting of a stiff tenacious clay, but within a short space it changed to a sandy gravel, containing fishes' teeth and corals in great abundance: the rock fragments have been derived from basaltic and secondary beds; the latter afforded the fossils contained in the following list, for the identification of which the author states that he has been indebted to Mr. J. de C. Sowerby. Serpula illium, L.; S. tetragona, L.; S. articulata, G. S.; S. granulata, C.; Terebratula rigida, U. Ch.; T.pisum, Ch. M.; T. striatula, L. Ch.; Gryphcea incurva, L.; G. dilatata, K. C.; Inoceramus, C; Avicula incequivalvis, L.; Exogyra virgula, K. C.; Crania striata, C.; Pollicipes maximus, C.; Ammonites Leachii, K. C.; A. annulatus, L.; A. dentatus, G.; A. spinosus, K. C.; A. serratus, O. C.; Belemnites acutus, L.; B. pistilliformis, L.; Littorina carinata, G. S.; Pentacrinites basaltiformis, L.; Encrinites moniliformis, O. The remains of fishes were, Otodus appendiculatus, C.; Galeuspristodontus, C.; Notidanus pristis, C.; Odontaspis rhaphiodon, C; Hybodus, U. O., which were determined for the author by Mr. S. P. Woodward. The Pleistocene deposit at the Copford brick-field consists, in an ascending order, of a bed of black vegetable matter, or peat, from six inches to one foot in thickness, resting immediately upon the "till i" from this stratum the following shells were procured, which were named for the author by Mr. S. P. Woodward: --Vertigo palustris; V. e...