| Vester Formation | |
|---|---|
| Stratigraphic range: Ladinian - Norian | |
| Type | Formation |
| Unit of | Olds Ferry Terrane |
| Sub-units | Brisbois Member |
| Area | Central Oregon |
| Location | |
| Coordinates | 44.118° N, 119.483° W |
| Region | Oregon |
| Country | United States |
The Vester Formation is a geologic formation in Oregon which preserves fossils dating back to the Triassic period. The partial skeleton of a new genus of basal thalattosaur has been recovered from the Brisbois Member of this formation.[1] The Brisbois Member, which dates to between the Carnian and Norian, is a marine sequence primarily composed of fine-grained clastic sedimentary rocks with fissile mudstones of black, green or gray variety broken up by widely spaced intervals of calcirudite beds and calcareous conglomerate.[2] The formation formed between two parallel island arcs, that of the Baker Terrane and the Olds Ferry Terrane. The formation mostly consists of reworked chert grains from the Baker Terrane.[3] In addition to the remains of the basal thalattosaur, fragmentary and undescribed remains exist of an ichthyosaur, archosaur, and a hybodontid shark as well as many invertebrate fossils.[1]
See also
References
- 1 2 Metz, Eric T. (2019). Description, phylogenetic analysis and taphonomy of a new Thalattosaur from the Brisbois member of the Vester Formation (Carnian/Norian) of central Oregon (ms thesis). University of Alaska Fairbanks.
- ↑ Dickinson and Vigrass, 1965
- ↑ Dorsey and LaMaskin, 2007
Sources
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.