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5
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moss animals, single-cell animals & calcium carbonate shell, more advanced than corals
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8
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extinct cnidarian, made reefs during paleozoic, called 'horn corals'
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9
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sea scorpions, extinct marine predators, can climb out of water to find food, up to 6 ft big
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10
|
shells on upper & lower body, symmetrical at midline, articulated or inarticulated types
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11
|
easily identified fossil with wide geographic distribution and short range, guide fossils
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12
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have 5-fold symmetry, include crinoids, starfish, sea lilies, can grow back missing parts
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13
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'arms on head' include ammonites & nautiloids, today include octopus/squid
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|
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|
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1
|
bivalves, symmetry between 2 shells, clams, oysters, scallops, mollusks
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2
|
snails/slugs, confused with ammonites but - occupy different part of shell
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3
|
natural sea sponges, colonial, primitive single cell organism, soft body & exoskeleton
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4
|
extinct index fossil, spiral shaped shell that extends as they grow, old house buoyancy
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6
|
extinct marine arthropods, famous fossil group, 17,000 species, 3 body segments
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7
|
single cell polyps that built large reef structures with horizontal floor levels
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13
|
look like plants, stem attaches to sea floor, lots of little feeding arms
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