A Monograph Of The Mollusca From The Great Oolite

Author : John Morris
Publisher : Forgotten Books
ISBN 13 : 9780666089144
Total Pages : 200 pages
Book Rating : 4.0/5 (891 download)

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Download or read book A Monograph of the Mollusca From the Great Oolite Chiefly From Coast and the Coast, Vol. 1 (Classic Reprint) written by John Morris and published by Forgotten Books. This book was released on 2018-02-21 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A Monograph of the Mollusca From the Great Oolite Chiefly From Coast and the Coast, Vol. 1 The authors of the present Monograph, after due consideration of the materials at their disposal, have thought fit to limit their illustrations to the Testacea of the Great or Bath Oolite a term under which they would include the series of beds situated between the Pullers-earth strata upon which they repose, and the Bradford clay to which they are subjacent. To have enlarged the plan, so as to include the Testacea of the Corn brash and Forest marble, would doubtless have been more comprehensive; but in the present state of our knowledge, the advantage would have been rather apparent than real. It will be found that the very few univalves which have been assigned to those deposits are almost without exception contained likewise in the Great Oolite, and will be found in the Monograph. It is, moreover, not impossible, that at some future time a series of univalves may be obtained from the Cornbrash, or Forest marble, differing specifically from those of the Great Oolite, in which case a separate Monograph, or an appendix to the present one, might be given. It is much to be regretted, that collections of shells should have been procured from so few situations in the long course of the formation in this country; and when it is remembered, that the Great Oolite constitutes a member of that series of secondary rocks which first engaged the attention of geologists, some surprise will mingle with our regret. The defect, however, would appear to be of easy explanation. The shells do not lie upon the surface, or become separated from the matrix by the action of the weather; they are to be procured only by carefully working away the investing stone when practicable, which is not always the case: there are likewise large areas constituting, probably, the greater portion of the formation, which are altogether des titute of organic remains, or contain only a finely comminuted shelly drift; the areas containing assemblages of well-preserved shells, would appear to be of small extent, and the presence of several of these in the vicinity of the residence of one of the authors, together with the great profusion of undescribed testacea which they have produced, have constituted the principal inducement to the present attempt of describing them; these favorable circumstances have enabled them to ascertain the position and vertical range of the species with a greater degree of accuracy than would otherwise have been possible. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.