Life at the start of the Ordovician remained confined to the seas with new animals evolving in place of those that didn't survive the Cambrian. Chief among them were the squidlike nautiloids ...
The Ordovician world was a watery one in which ... They come from arthropods — the group of animals including insects, spiders, scorpions, shrimp, cnidarians (jellyfish and corals), plus algae ...
The hard structure of the animal is composed of plates of crystalline calcium carbonate. Crinoids first appeared in Early Ordovician rocks. Although crinoids still exist today, the species found in ...
The Paleozoic era's Silurian period saw animals and plants finally emerge on land. But first there was a period of biological regrouping following the disastrous climax to the Ordovician.
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