Several stratigraphic units in Colombia have provided fossils. The richest formations are the Devonian Cuche and Floresta Formations, the Cretaceous Paja Formation, the Paleocene Cerrejón Formation and the Miocene La Venta site. The latter is the richest Konzentrat-Lagerstätte in northern South America and comprises the formations of the Honda Group.
Fossiliferous stratigraphic units
Formations are ordered according to their youngest age
Proposed reclassification of South American gomphotheres
Some authors, Lucas, Mothé, Avilla et al., propose a reclassification of the South American gomphotheres as follows:
- Stegomastodon is an exclusively North American genus
- Haplomastodon is a South American genus, but synonymous with Notiomastodon
- as Notiomastodon was defined earlier, all Haplomastodon species should be considered part of Notiomastodon
- all formerly described species as Stegomastodon sp., Haplomastodon sp. and Notiomastodon sp. belong to a single species; Notiomastodon platensis
- Cuvieronius is the only remaining South American genus outside of Notiomastodon
Evolution
- Lucas (2010, 2013) proposes that Notiomastodon evolved from Cuvieronius inside South America
- Mothé et al. (2012, 2015, 2016) propose that Notiomastodon and Cuvieronius reached South America in two separate migration waves
See also
Notes and references
Notes
References
Bibliography
Pleistocene-Holocene
Cocinetas Basin
Honda Group
Bogotá Formation
Cerrejón Formation
La Frontera Formation
Paja Formation
Murca Formation
Jurassic
Cuche & Floresta Formations
Cambro-Ordovician
Other formations
South American gomphotheres
External links