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Excerpt from Type Ammonites VII, Vol. 7
The order now given would appear to be the biological order of the three forms. D. Dichotomum reaches a diameter of 173 mm. Without Showing any Sign of the old-age character, large ribs, or even of ribs set more distantly - a preliminary to the stage of big ribs. D. Strumatum shows wider spacing and enlargement of ribs at about 160 mm. Diameter, a huge-rib stage from about 190 to 230 mm. And a stage of distant, but not so gross ribs afterwards: D. Variocostatum passes over to the distant ribbed stage at about 180 mm. Diam.; but the subsequent enlarged ribs are of low elevation comparable with the ribs of D. Strumatum, as if the gross-ribbed stage had been altogether skipped and there had been direct passage to the less swollen rib-stage of D. Strumatum.
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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.
Titel: Type Ammonites VII, Vol 7 Classic Reprint
Verlag: Forgotten Books
Erscheinungsdatum: 2018
Einband: HRD
Zustand: New
Anbieter: PBShop.store UK, Fairford, GLOS, Vereinigtes Königreich
HRD. Zustand: New. New Book. Shipped from UK. Established seller since 2000. Artikel-Nr. LX-9780656421404
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