"0.125"^^ . . "guide fossil"@en-us . "108729996"@en-us . "109311067"^^ . . . . "index fossil"@en-us . "index fossil"^^ . . . "a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found"@en-us . . . . "0"^^ . . "09311067-n"^^ .