Protoprioniodus
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''Protoprioniodus'' is an extinct genus of
conodont Conodonts, are an extinct group of marine jawless vertebrates belonging to the class Conodonta (from Ancient Greek κῶνος (''kōnos''), meaning " cone", and ὀδούς (''odoús''), meaning "tooth"). They are primarily known from their hard ...
s.


Use in stratigraphy

The Whiterock Stage refers mainly to the early Middle Ordovician in North America. It is often used in the older literature in a global sense. The Whiterock Stage is given a range from 471.8 (ca. 472) to 462 m.y.a., spanning close to 10 million years. Officially its start is defined by the potentially lowest occurrence of the conodonts ''Protoprioniodus aranda'' or '' Baltoniodus triangularis''.


References


External links

* * Prioniodontida genera Ordovician conodonts {{conodont-stub