Vester Formation

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Vester Formation
Stratigraphic range: Ladinian - Norian
Type Formation
Unit ofOlds Ferry Terrane
Sub-unitsBrisbois Member
AreaCentral 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]

Contents

See also

References

  1. 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.
  2. ↑ Dickinson and Vigrass, 1965
  3. ↑ Dorsey and LaMaskin, 2007

Sources

(1)Saunders Quarry-1.jpg

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