''Baltoniodus'' is an extinct genus of
conodonts.
Use in stratigraphy
The base of the
Dapingian
The Dapingian is the third stage of the Ordovician period and the first stage of the Middle Ordovician series. It is preceded by the Floian and succeeded by the Darriwilian. The top of the Floian is defined as the first appearance of the conodont ...
, 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
The Sandbian is the first stage of the Upper Ordovician. It follows the Darriwilian and is succeeded by the Katian. Its lower boundary is defined as the first appearance datum of the graptolite species '' Nemagraptus gracilis'' around million yea ...
Bromide Formation
The Bromide Formation is a geological formation in Oklahoma, USA. It is well known for its diverse echinoderm and trilobite fossil fauna.
Location
The Bromide Formation crops out in the Arbuckle and Wichita Mountains and in the Criner Hills ...
, in Oklahoma, USA.
References
External links
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Prioniodontida genera
Ordovician conodonts
Middle Ordovician first appearances
Late Ordovician extinctions
Bromide Formation
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