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ammonites amphibians ancient angiosperms animals and plants arthropods Australia Australopithecus became extinct belemnites belong birds bivalve body bones brachiopods brittlestar bryozoan buried calcite called Cambrian Carboniferous Cenozoic cephalopods chalky claws Club mosses coal coelacanth coiled colony color common cones conifer coral crab Cretaceous decay Devonian dinosaur Diprotodon dogfish Edmontosaurus eggs Eocene Eryops example fern fish formed fossil record fossils found fossilized Gastropod geological hard human ichthyosaurs jaws Jurassic kangaroo known land legs limestone living today lizards lycopod mammals marsupial meat eater Mesozoic million years ago million years old mineral Miocene modern species mollusks Mosasaurs mussel numbers Paleozoic placental mammals plates Pleistocene plesiosaur Pliocene predators preserved probably pterosaurs remains reptiles sand scallop sea bed sea urchins sediment seeds shape shark Silurian similar skeletons skull snail shell snakes soft specimen spines sponge squid starfish stones surface tail teeth tissues toadstones tooth tree Triassic trilobites vertebrates