Gabbs Formation
| Gabbs Formation | |
|---|---|
| Stratigraphic range: Norian-Hettangian ~ | |
| Type | Formation |
| Unit of | Volcano Peak Group |
| Sub-units | Nun Mine, Mount Hyatt & Muller Canyon Members |
| Underlies | Sunrise Formation |
| Overlies | Luning Formation |
| Lithology | |
| Primary | Siltstone, limestone |
| Other | Mudstone |
| Location | |
| Coordinates | Lua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value). |
| Approximate paleocoordinates | Lua error: callParserFunction: function "#coordinates" was not found. |
| Region | Nevada |
| Country | United States |
| Type section | |
| Named for | Gabbs Valley Range |
| Named by | Muller & Ferguson |
| Year defined | 1939 |
  Gabbs Formation (the United States)  Gabbs Formation (Nevada) | |
The Gabbs Formation is a geologic formation in Nevada. It preserves fossils dating back to the Late Triassic and Early Jurassic periods, and is one of the few formations in the United States known to include the Triassic-Jurassic boundary.[1][2][3][4] In 2007, an exposure of the Gabbs Formation at New York Canyon was proposed a candidate GSSP for the Hettangian stage, the first stage of the Jurassic.[5] However, the New York Canyon section was ultimately not selected as Hettangian GSSP, which instead went to the Kuhjoch section (Kendlbach Formation) of Austria in 2010.[6]
Fossil content
[edit | edit source]The Gabbs Formation hosts several diverse assemblages of ammonites, bivalves, and other invertebrates.[1] In 2021, several ammonites were newly described from the formation:[7]
- Arcestes lawsi
- Paracochloceras nunminensis
- Peripleurites gabbensis
- Placites heggi
- Rhacophyllites mulleri
- R. volcanoensis
See also
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References
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- Geologic formations of Nevada
- Triassic System of North America
- Norian Stage
- Rhaetian Stage
- Jurassic System of North America
- Hettangian Stage
- Limestone formations of the United States
- Mudstone formations of the United States
- Siltstone formations of the United States
- Shallow marine deposits
- Open marine deposits
- Paleontology in Nevada