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Gnathodus
Extinct genus of jawless fishes From Wikipedia, the free encyclopedia
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Gnathodus is an extinct conodont genus in the family Idiognathodontidae.
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Use in stratigraphy
The Tournaisian, the oldest age of the Mississippian (also known as Lower Carboniferous), contains eight conodont biozones, 3 of which are defined by Gnathodus species:
- the zone of Gnathodus pseudosemiglaber and Scaliognathus anchoralis
- the zone of Gnathodus semiglaber and Polygnathus communis
- the zone of Gnathodus typicus and Siphonodella isosticha
The Visean, the second age of the Mississippian, contains four conodont biozones, two of which are defined by Gnathodus species:
- the Gnathodus bilineatus Zone
- the Gnathodus texanus Zone
The Serpukhovian, the third or youngest age of the Mississippian, includes four conodont biozones, two of which are defined by Gnathodus species:
- the Gnathodus postbilineatus Zone
- the Gnathodus bollandensis Zone
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References
External links
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