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Geologic time scale - Wikipedia, the free encyclopedia |
 | | Goniatites, brachiopods, bryozoa, bivalves, and corals plentiful in the seas. |
 | | Corals, bryozoa, goniatites and brachiopods (Productida, Spiriferida, etc.) very common. |
 | | Early corals, articulate brachiopods (Orthida, Strophomenida, etc.), bivalves, nautiloids, trilobites, ostracods, bryozoa, many types of echinoderms (crinoids, cystoids, starfish, etc.), branched graptolites, and other taxa all common. |
| en.wikipedia.org /wiki/Geologic_timescale (1908 words) |
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