Simple categories matching prehistoric:

• mammal,
• survivor,
• artifact,
• giant,
• animal,
• reptile,
• material,
• site,
• artefact,
• tool,
• beast,
• critter,
• dinosaur,
• item,
• creature,
• organism,
• relic,
• monument,

Members with property prehistoric:

• dinosaur,
• bone_pendant,
• projectile,
• animal,
• mammoth,
• dinosaur_poop,
• matting,
• pterodactyl,
• sabertooth_cat,
• woolly_mammoth,
• gulf_sturgeon,
• rhino,
• camel,
• rock_tool,
• mastodon,
• hairy_rhinoceros,
• earthenware,
• squid,
• cairn,
• dire_wolf,
• pterosaur,
• plesiosaur,
• trilobite,
• horse,
• ancient_pottery,
• shark,
• skeleton,
• tapir,
• flying_pterosaur,
• marsupial_lion,
• bison,
• shell,
• crinoid,
• wild_deer,
• wooly_rhino,
• ancient_shark,
• woolly_rhino,
• tyrannosaurus,
• giant_reptile,
• pelycosaur,
• antique_nail,
• fishing_implement,
• sabertooth_tigers,
• crocodile,
• marine_reptile,
• sabertoothed_cat,
• giant,
• stoneware,
• tyrannosaur,
• frog,
• sloth,
• hippo,
• giant_sloth,
• iron_tool,
• hyena,
• knife,
• plant,
• elephant,
• gomphothere,
• indian_pottery,
• brontosaurus,
• mortar,
• swimming_plesiosaur,
• moose,
• sabertoothed_tiger,
• steppe_bison,
• long_pestle,
• pelycosaur_dimetrodon,
• waste,
• fort,
• prehistoric_mammal,
• clovis_point,
• triceratops,
• sauropod,
• sabertoothed_tigers,
• stone_tool,
• colored_earthenware,
• lungfish,
• tool,
• pottery,
• sturgeon,
• bronze_ware,
• early_rhino,
• plankton,
• primitive_reptile,
• algae_morgan,
• lion,
• projectile_point,
• actual_dinosaur,
• wooly_mammoth,
• sabertooth_lion,
• huge_jar,
• immense_insect,
• dimetrodon,
• fossil,
• reptile,
• assorted_dinosaur,
• ichthyosaur,
• stone,
• weapon,
• flat_ax,
• scraper,
• huge_roach,
• bronze,
• stone_pillar,
• shell_adze,
• rhinoceros,
• sandal,
• painted_wood,
• clothing,
• woolly_rhinoceros,
• dugong,
• alligator,
• iguanodon,
• arrow_point,
• bone_tool,
• wild_horse,
• turtle,
• ceramics,
• reindeer,
• brontosaur,
• manatee,
• grinding_stone,
• lynx,
• shell_midden,
• fossil_bones,
• extinct_camel,
• burin,
• dinosaur_bones,
• ancient_earthwork,
• giant_bison,