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.
Referencesedit
^Prioniodontacean conodonts from the Emanuel Formation (Lower Ordovician) of Western Australia. RA McTavish, Geologica et Palaeontologica, 1973
protoprioniodus, extinct, genus, conodonts, temporal, range, middle, ordovician, preꞒ, scientific, classification, kingdom, animalia, phylum, chordata, class, conodonta, unranked, prioniodontida, family, paracordylodontidae, genus, mctavish, 1973, species, ara. Protoprioniodus is an extinct genus of conodonts ProtoprioniodusTemporal range Middle Ordovician PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification Kingdom Animalia Phylum Chordata Class Conodonta unranked Prioniodontida Family Paracordylodontidae Genus ProtoprioniodusMcTavish 1973 1 Species Protoprioniodus aranda Protoprioniodus cowheadensis Protoprioniodus nyinti Protoprioniodus papiliosus Protoprioniodus simplicissimus type Protoprioniodus yapuUse in stratigraphy editThe 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 edit Prioniodontacean conodonts from the Emanuel Formation Lower Ordovician of Western Australia RA McTavish Geologica et Palaeontologica 1973External links edit Protoprioniodus at the Encyclopedia of Life Protoprioniodus Fossilworks Gateway to the Paleobiology Database Retrieved 2 July 2016 nbsp This article about a conodont is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Protoprioniodus amp oldid 1100477539, wikipedia, wiki, book, books, library,
