Eoconodontus is an extinct genus of conodonts of the Late Cambrian. It is a two-elements (rounded and compressed) genus from the Proconodontus lineage.[1]
Use in stratigraphy
It is suggested that Eoconodontus notchpeakensis can be a marker of the Stage 10 of the Furongian the fourth and final series of the Cambrian.[2]
In 2006, a working group proposed the first appearance of Cordylodus andresi. Currently the first appearance of E. notchpeakensis is favored by many authors because it is globally widespread and is independent of facies (known from continental rise to peritidal environments).[3]
The Eoconodontus notchpeakensis proposal would also incorporate a non-biostratigraphic marker to correlate the beginning of Stage 10 globally. A carbon isotope excursion (the HERB-event) occurs in the lower part of the E. notchpeakensis range.
References
^ abTaxonomic revisions of some Upper Cambrian and Lower Ordovician Conodonts with comments on their Evolution. J. F. Miller, The University of Kansas Paleontological Contributions: Paper 99, 1980 (URL)
^Proposed GSSP for the base of Cambrian Stage 10 at the lowest occurrence of Eoconodontus notchpeakensis in the House Range, Utah, USA. James F. Miller, Robert L. Ripperdan, James D. Loch, Rebecca L. Freeman, Kevin R. Evans, John F. Taylor and Zachary C. Tolbart, Annales de Paléontologie, Volume 101, Issue 3, July–September 2015, Pages 199–211, doi:10.1016/j.annpal.2015.04.008
^Landing, E.; Westrop, S.R.; Adrain, J.M. (19 September 2011). "The Lawsonian Stage - the Eoconodontus notchpeakensis FAD and HERB carbon isotope excursion define a globally correlatable terminal Cambrian stage". Bulletin of Geosciences, pages 621–640, doi:10.3140/bull.geosci.1251
