Simple categories matching prehistoric:

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

Members with property prehistoric:

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