Index fossil synonyms, index fossil antonyms - FreeThesaurus.com
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Synonyms for 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
References in periodicals archive
But Ashley's tiny index fossil
had even more secrets to reveal.
aequabilis, which are the index fossils
for the lowermost Devonian.
Ammonites are excellent index fossils
, meaning it is often possible to link the rock layer in which a particular species is found to specific geological time periods.
The fossil bones belong to ancestors of our modern baleen whales and their age was determined using so-called co-occurring index fossils
Because these fossils -- known as index fossils
-- are widely distributed around the planet but limited in the time span in which they were laid down, their discovery provides an accurate method of dating other fossils around them.