Earth history; Ordovician

Click on a fossil Megistaspis sp Discoceras sp Orthoceras sp Hormotoma sp Brachiopoda indet. Dikelokephalina sp Streptelasma sp Diplotrypa sp & Monotrypa sp Illaenus sp Asaphus sp Rhabdinipora sp Lingula sp Didymograptus sp / Diplograptus sp Ordovician
In the Ordovician, the continents lay along the Equator and to the south of it. The calcareous sediments that we find, tell us that at this time, there were large, shallow seas with clear and warm water. This provided a good environment for algal growth which in turn was food for a teeming animal life:
- corals, sponges, bryozoans and lime producing algae (reef builders)
- trilobites, brachiopods, gastropods and echinoderms (reef dwellers)
- shell bearing cephalopods (nautiloids), which developed gas-filled chambers, were active swimmers and were probably among the first real predators. 
List of contents in the Earth history; Ordovician showcase

Klikk på en tidsperiode Prekambrium Kambrium Ordovicium Silur Devon Karbon Perm Kvartær Trias Jura Kritt Tertiær
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Publisert 18. mai 2011 16:00 - Sist endret 13. mai 2019 13:56