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earliestperiod of marine life-trilobites are dominant.
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Echinoderms, starfish, sand dollar, sea urchin, and sea cucumbers. Invertabrates are dominant, mollusks become abundant, earliest fish that are jawless and, later jawed armored fish.
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Earliest terrestrial plants, and animals. Tiktaalik, Eurypterids develope.
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Armored fish go extinct, but Abundance of several species of fish, earliest Amphibians and ammonites.
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Abundant sharks, and amphibians, large swamps, and coal forming forests. Earliest reptiles, scale trees, and seed ferns.
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Extinct of many types of marine animals imcluding Trilobites
