index fossil


Definition of index fossil

: a fossil usually with a narrow time range and wide spatial distribution that is used in the identification of related geologic formations

Examples of index fossil in a Sentence

Recent Examples on the Web

Pappas reports that Agnostus is a great index fossil. Jason Daley, Smithsonian, "Look Into the Creepy-Cute Eyes of This Reconstructed, 500-Million-Year-Old Creature," 19 Sep. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'index fossil.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of index fossil

1900, in the meaning defined above

Keep scrolling for more

Learn More about index fossil

Statistics for index fossil

Look-up Popularity

Time Traveler for index fossil

The first known use of index fossil was in 1900

See more words from the same year

More from Merriam-Webster on index fossil Encyclopedia article about index fossil

Comments on index fossil

What made you want to look up index fossil? Please tell us where you read or heard it (including the quote, if possible).


using a distributed computer network

Get Word of the Day daily email!

Test Your Vocabulary

Time Traveler Quiz: Which Word Came First?

  • time traveler quiz which word came first
  • Which came first?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!