cretaceous period Jura period 1 [vynechat] dinosaurs 1 [vynechat] dinosaury 1 [vynechat] druhohory 1 [vynechat] extinction (biology) 1 [vynechat] geochronology 1 [vynechat] geochronológia 1 [vynechat] geological research 1 [vynechat] geologický výskum 1 [vynechat] jura 1 [vynechat] krieda 1 [vynechat] krieda (stratigrafia) 1 [vynechat] mesozoic 1 [vynechat] mineral mining 1 [vynechat] natural disasters 1 [vynechat] prírodné katastrofy 1 [vynechat] trias 1 [vynechat] triassic 1 [vynechat] vymieranie druhov 1 [vynechat] ťažba nerastných surovín 1 [vynechat]