The trilobites decreased in these two periods while corals, echinoderms and brachiopods advanced. Slides include eurypterids, corals, brachiopods, bryozoans, echinoderms, scorpions, the first land plant Cooksonia, placoderms(armored fish), lungfish, lobe-finned fish, the earliest amphibian Ichthyostega and several early land plants.
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