File:NIE 1905 Historic-Geologic Distrib of Crustracea.jpg
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| Description |
English: A table indicating in a rough way the larger classification of the Crustacea and the distribution and expansion of the various subdivisions in past geologic times. It shows that certain types, especially the more primitive, played more important roles in the early ages than they do at present, and that they have been superseded by the more specialized types. The letters at the heads of the vertical columns indicate the geological systems as follows: C, Cambrian; O, Ordovician; S, Silurian; D, Devonian; Cb, Carboniferous; P, Permian; T, Triassic; J, Jurassic; Cr, Cretaceous; E, Eocene; M, Miocene: Pl, Pliocene; R, Recent. An interrogation-point ("?") indicates the doubtful presence of a member of the group, and the width of the black line indicates in a very imperfect way the relative amount of expansion of the group. |
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| Date | published 1905 | ||
| Source | The New International Encyclopædia, v. 5, 1905, p. 632. | ||
| Author | Unknown author | ||
| Permission (Reusing this file) |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:31, 20 May 2013 | | 745 × 1,184 (211 KB) | Bob Burkhardt | {{Information |Description={{en|A table indicating in a rough way the larger classification of the Crustacea and the distribution and expansion of the various subdivisions in past geologic times. It shows that certain types, especially the more primiti... |
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