Baltoniodus

Baltoniodus Temporal range: Dapingian–Sandbian PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	†Conodonta
(unranked):	†Prioniodontida
Family:	†Balognathidae
Genus:	†Baltoniodus Lindström, 1971[1]
Species
†Baltoniodus alobatus †Baltoniodus gerdae †Baltoniodus medius †Baltoniodus navis †Baltoniodus norrlandicus †Baltoniodus prevariabilis †Baltoniodus triangularis †Baltoniodus variabilis

Baltoniodus is an extinct genus of conodonts.

Use in stratigraphy

The base of the Dapingian, the third stage of the Middle Ordovician, is defined as the first appearance of Baltoniodus triangularis.

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 conodont Protoprioniodus aranda or Baltoniodus triangularis.

B. gerdae has been found in the early Sandbian Bromide Formation, in Oklahoma, USA.

References

1. Vom Anfang, Hochstand und Ende eines Epikontinentalmeeres. Maurits Lindström, Geologische Rundschau, March 1971, Volume 60, Issue 2, pages 419-438, doi:10.1007/BF02000464

External links

• Baltoniodus at fossilworks.org (retrieved 1 July 2016)