File: Fusulinid--Permian protist.jpg - New World Encyclopedia

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The Fusulinid, a single-celled organism that grew a shell in an expanding spiral, is used as a geologic marker because it was so abundant as to form layers of limestone and its shell changed significantly over its 80 million years on Earth. It went extinct at the end of the Permian period.

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current14:38, 12 November 2008Thumbnail for version as of 14:38, 12 November 2008640 × 480 (201 KB)Glenn Strait (talk | contribs)[[Image:Fusulinid--Permian_protist.jpg|right|thumb|The Fusulinid, a single-celled organism that grew a shell in an expanding spiral, is used as a geologic marker because it was so abundant as to form layers of limestone and its shell changed significantly

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