A Manual of Paleontology for the Use of Students: With a General Introduction on the Principles (Classic Reprint) - Hardcover

Nicholson, Henry Alleyne

9780266555216: A Manual of Paleontology for the Use of Students: With a General Introduction on the Principles (Classic Reprint)

Hardcover

ISBN 10: 0266555217 ISBN 13: 9780266555216

Publisher: Forgotten Books, 2018

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Excerpt from A Manual of Paleontology for the Use of Students: With a General Introduction on the Principles

It only remains to add that there is sometimes a further complication. If the rock be very porous and permeable by water, it may happen that the original shell is entirely dissolved away, leaving the interior cast loose, like the kernel of a nut, within the case formed by the exterior cast. Or it may happen that subsequent to the attainment of this state of things, the space thus left vacant between the interior and exterior cast the space, that is, formerly occupied by the shell itself - mg be filled up by some foreign mineral deposited there by the infiltration of water. In this last case the splitting open of the rock would reveal an interior east, an exterior cast, and a body which would have the exact form of the original but which would be really a much later formation, and which would not exhibit under the microscope the minute structure of shell.

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