تعريف index fossil في الإنجليزية الإنجليزية القاموس.
Any ancient remains of a plant or animal that lived during a specific geological period and that can be used to date the containing rocks
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
The fossil remains of an organism that lived in a particular geologic age, used to identify or date the rock or rock layer in which it is found. Also called guide fossil