| 词条 | Hoback Formation |
| 释义 |
| name = Hoback Formation | image = | caption = | type = Formation | age = Paleogene | period = Paleogene | prilithology = | otherlithology = | namedfor =Hoback River | namedby = | region = Wyoming | country = United States | coordinates = | unitof = | subunits = | underlies =Pass Peak Conglomerate | overlies = | thickness =4572 m | extent = | area = | map = | map_caption = }} 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. 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] See also{{Portal|Earth sciences|Wyoming|Paleontology|Paleogene|Cenozoic}}
References1. ^1 {{Cite journal|last=Dorr|first=John|date=January 1962|title=Early Cenozoic stratigraphy and vertebrate paleontology of the Hoback Basin, Wyoming|url=|journal=GSA Bulletin|volume=63|issue=|doi=10.1130/0016-7606(1952)63[59:ecsavp]2.0.co;2|pmid=|access-date=|via=}} 2. ^{{Cite journal|last=Spearing|first=Darwin|date=1969|title=Stratigraphy and sedimentation of the Paleocene-Eocene Hoback Formation, Western Wyoming|url=http://www.netl.doe.gov/kmd/CDs/Disk7/disk2/WGS/Stratigraphy%20and%20Sedimentation%20of%20the%20Paleocene-Eocene%20Hobac.pdf|journal=Wyoming Geological Association Guidebook|volume=|issue=|doi=|pmid=|access-date=|via=}}
1 : Paleogene geology of Wyoming |
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