Search Result for "index_fossil":
Wordnet 3.0

NOUN (1)

1. 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;
[syn: index fossil, guide fossil]



WordNet (r) 3.0 (2006):

index fossil
    n 1: 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 [syn: index fossil, guide fossil]