Biology:Baltoniodus
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Baltoniodus is an extinct genus of conodonts.
Use in stratigraphy
The base of the Dapingian, the first stage of the Middle Ordovician, is defined as the first appearance of Baltoniodus triangularis.[1]
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
- ↑ David A. T. Harper; Tõnu Meidla; Thomas Servais (May 10, 2023). "A short history of the Ordovician System: from overlapping unit stratotypes to global stratotype sections and points" (in en). Geological Society, London, Special Publications (The Geological Society of London) 532 (1): 13–30. doi:10.1144/SP532-2022-285. Bibcode: 2023GSLSP.532..285H. https://pubs.geoscienceworld.org/gsl/books/edited-volume/2475/chapter/138444251/A-short-history-of-the-Ordovician-System-from.
External links
- Baltoniodus at fossilworks.org (retrieved 1 July 2016)
Template:Conodonts Wikidata ☰ Q25349822 entry
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