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Conodonts are an extinct group of agnathan (jawless) Fish resembling eels, classified in the class Conodonta. For many years, they were known only from their tooth-like oral elements found in isolation and now called conodont elements. Knowledge about soft tissues remains limited. They existed in the worlds oceans for over 300 million years, from the Cambrian to the beginning of the Jurassic. Conodont elements are widely used as index fossils, fossils used to define and identify geological periods. The animals are also called Conodontophora to avoid ambiguity.
In the geologic timescale, the Telychian is the age of the Llandovery Epoch of the Silurian Period of the Paleozoic Era of the Phanerozoic Eon. The Telychian Age was between 438.5 ± 1.2 million years ago (Ma) and 433.4 ± 0.8 Ma. The Telychian Age succeeds the Aeronian Age and precedes the Sheinwoodian Age. The name of the interval is derived from the Pen-lan-Telych Farm near Llandovery, Powys, Wales. The GSSP is located within the Wormwood Formation.
In the geological timescale, the Llandovery Epoch occurred at the beginning of the Silurian Period. The Llandoverian Epoch follows the massive Ordovician-Silurian extinction events, which led to a large decrease in biodiversity and an opening up of ecosystems.
The Lau event was the last of three relatively minor mass extinctions during the Silurian period. It had a major effect on the conodont fauna, but barely scathed the graptolites. It coincided with a global low point in sea level, is closely followed by an excursion in geochemical isotopes in the ensuing late Ludfordian faunal stage and a change in depositional regime.
Cordylodontidae is a family of conodonts.
Proconodontida is an order of conodonts.
Edward B. Branson was an American geologist and paleontologist. He worked at the University of Missouri.
Wurmiella is an extinct conodont genus.
Spathognathodontidae is an extinct conodont family ranging from the Silurian to the Devonian.
Ozarkodina is an extinct genus of conodonts in the family Spathognathodontidae.
George Jennings Hinde was a British geologist and paleontologist.
Pterospathodontidae is an extinct conodont family in the order Ozarkodinida.
Kockelella is an extinct genus of conodonts in the family Kockelellidae from the Silurian.
Anticostiodus is an extinct genus of multielement conodonts. Specimens have been described from the Lower Silurian of Gun River Formation of Anticosti Island, Quebec. Two species are included under the genus, Anticostiodus fahraeusi and Anticostiodus boltoni. Both species occur near the base of the Distomodus staurognathoides zone and in an open subtidal environment.
Distomodus is an extinct genus of conodonts.
Kallidontus is an extinct genus of conodonts.
Pterospathodus is an extinct genus of conodont from the Silurian period.
Oulodus is a genus of conodonts in the family Prioniodinidae.
The Waukesha Biota refers to the biotic assemblage of the Konservat-Lagerstätte of Early Silurian age within the Brandon Bridge Formation in Waukesha County and Franklin, Milwaukee County, Wisconsin. It is known for the exceptional preservation of its diverse, soft-bodied and lightly skeletonized taxa, including many major taxa found nowhere else in strata of similar age.
References
- ↑ Conodonten des Silurs. Otto H. Walliser, Hessisches Landesamt für Bodenforschung, 1964 - 106 pages
- ↑ Silurian conodonts from the Llano region, Texas. RH Miller, Journal of Paleontology, Vol. 46, No. 4 (Jul., 1972), pages 556-564 (Stable URL retrieved 3 May 2016)
