Astrophysics (Index)About


(geological sign of consequences of life)

The term geosignature is now used in extra-solar planet studies. I've seen it defined as geological features that (could) result from the presence of life. One sees the phrase bio- and geosignatures.

The term can be used surface geological features such as types of rock that may be the result of life, but sometimes appears to refer to any biosignature that is not literally life itself (as would be a green color of plants themselves, or more likely, a vegetation red edge or biofluorescence), including atmosphere or surface liquid features.

I have seen the term geosignature used in non-astronomy, non-biology senses, to mean "geological features that are the sign of something", such as (on Earth) "geosignatures of oil" when speaking of a potential oil field.

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