• noun
• synonym
• antonym

• fossil copal (noun)
  1. partly mineralized copal dug from the ground
• fossil fuel (noun)
  1. a FUEL such as coal or oil that is produced by the very gradual decaying of animals or plants over millions of years
• fossil oil (noun)
  1. a dark oil consisting mainly of hydrocarbons
• guide fossil (noun)
  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
• index fossil (noun)
  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
• living fossil (noun)
  1. an ancient animal or plant that still exists and has not changed
• trace fossil (noun)
  1. a fossil of a trace of an organism rather than the physical remains of the organism itself, e.g. burrows, trails, etc.
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