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Geological formation in Wyoming From Wikipedia, the free encyclopedia
The Hoback Formation is a geologic formation in west-central Wyoming, located within the Hoback Basin (directly north of the Green River Basin). It formed as a result of increased sedimentation rates from the Laramide Orogeny[1] and preserves fossils dating back to the late Paleogene period, through the early Eocene.
Hoback Formation | |
---|---|
Stratigraphic range: Paleogene | |
Type | Formation |
Underlies | Pass Peak Conglomerate |
Thickness | 4572 m |
Location | |
Region | Wyoming |
Country | United States |
Type section | |
Named for | Hoback River |
The Hoback Formation was likely formed in a forested floodplain environment during a period of humid climate, as indicated by plentiful coal, carbonaceous shale, and fossilized plant remains. Many of the beds observed are dull in color, indicating that they formed in a reducing environment - another sign of a floodplain depositional environment, as standing water and waterlogged soil would be present for a substantial portion of the year. A prominent sandstone facies (with crossbedding, overbank deposits, and large pebbly deposits), thought to represent a large stream, is also present through much of the formation.[2]
Fossils found within the Hoback Formation include bone fragments, turtles, larger mammals, molluscs, scales, fish teeth, and a wide variety of fossilized plant material (including fossilized wood). Signs of early Cenozoic crocodiles have also been found.[1]
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