index fossil   (TTS Sound)

The index_fossil has 1 Senses.

• guide fossil, index fossil
• 示準化石
• 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
• 見つかった岩層に日付を入れるのに用いられる特定の地質学的年齢に生きたために知られている化石