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Fusulina
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fusulinid
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Fusulina

fossil foraminiferan genus
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History

Fusulina, genus of extinct fusulinid foraminiferans (protozoans with a shell) found as fossils in marine rocks of Late Carboniferous age (286 to 320 million years old). Fusulina, an excellent index fossil for Late Carboniferous rocks, enables widely separated rocks to be correlated.