# Gabbs Formation > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Gabbs_Formation > Markdown URL: https://mediated.wiki/source/Gabbs_Formation.md > Source: https://en.wikipedia.org/wiki/Gabbs_Formation > Source revision: 1295435712 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) {{Short description|Geologic formation in Nevada, United States}} {{Infobox rockunit | name = Gabbs Formation | image = | caption = | type = [Formation](/source/Formation_(stratigraphy)) | age = [Norian](/source/Norian)-[Hettangian](/source/Hettangian)
~{{fossil range|225|199}} | period = Rhaetian | prilithology = [Siltstone](/source/Siltstone), [limestone](/source/limestone) | otherlithology = [Mudstone](/source/Mudstone) | namedfor = [Gabbs Valley Range](/source/Gabbs_Valley_Range) | namedby = Muller & Ferguson | year_ts = 1939 | region = [Nevada](/source/Nevada) | country = [United States](/source/United_States) | coordinates = {{coord|38.5|N|118.1|W|display=inline,title}} | paleocoordinates = {{coord|18.1|N|55.7|W|display=inline}} | unitof = [Volcano Peak Group](/source/Volcano_Peak_Group) | subunits = Nun Mine, Mount Hyatt & Muller Canyon Members | underlies = [Sunrise Formation](/source/Sunrise_Formation) | overlies = [Luning Formation](/source/Luning_Formation) | thickness = | extent = | area = | map = {{Location map+ | United States#Nevada | relief = 1 | width = 250 | float = center | places = {{Location map~ | United States#Nevada | lat_deg = 38.5 | lon_deg = -118.1 | mark = Pink ff0080 pog.svg | marksize = 12 }} }} | map_caption = }} The '''Gabbs Formation''' is a [geologic formation](/source/Formation_(geology)) in [Nevada](/source/Nevada). It preserves [fossils](/source/fossils) dating back to the [Late Triassic](/source/Late_Triassic) and [Early Jurassic](/source/Early_Jurassic) [periods](/source/Period_(geology)), and is one of the few formations in the United States known to include the Triassic-Jurassic boundary.{{Cite journal|last=Laws|first=Richard A.|date=1982-03-01|title=Late Triassic depositional environments and molluscan associations from west-central Nevada|url=https://dx.doi.org/10.1016/0031-0182%2882%2990036-0|journal=Palaeogeography, Palaeoclimatology, Palaeoecology|language=en|volume=37|issue=2|pages=131–148|doi=10.1016/0031-0182(82)90036-0|bibcode=1982PPP....37..131L |issn=0031-0182|url-access=subscription}}{{Cite journal|last1=Taylor|first1=David G.|last2=Smith|first2=Paul L.|last3=Laws|first3=Richard A.|last4=Guex|first4=Jean|date=October 1983|title=The stratigraphy and biofacies trends of the Lower Mesozoic Gabbs and Sunrise formations, west-central Nevada|url=https://www.researchgate.net/publication/237172584|journal=Canadian Journal of Earth Sciences|language=en|volume=20|issue=10|pages=1598–1608|doi=10.1139/e83-149|bibcode=1983CaJES..20.1598T }}{{Cite journal|last1=Hallam|first1=A.|last2=Wignall|first2=P. B.|date=2000-01-01|title=Facies changes across the Triassic–Jurassic boundary in Nevada, USA|url=https://www.researchgate.net/publication/249547053|journal=Journal of the Geological Society|language=en|volume=157|issue=1|pages=49–54|doi=10.1144/jgs.157.1.49|bibcode=2000JGSoc.157...49H |s2cid=131484322 |issn=0016-7649}}{{Cite journal|last1=Ward|first1=Peter D.|last2=Garrison|first2=Geoff H.|last3=Williford|first3=Ken H.|last4=Kring|first4=David A.|last5=Goodwin|first5=David|last6=Beattie|first6=Michael J.|last7=McRoberts|first7=Christopher A.|date=2007-02-09|title=The organic carbon isotopic and paleontological record across the Triassic–Jurassic boundary at the candidate GSSP section at Ferguson Hill, Muller Canyon, Nevada, USA|url=http://personal.denison.edu/~goodwind/ward_etal_2007.pdf|journal=Palaeogeography, Palaeoclimatology, Palaeoecology|series=Triassic-Jurassic Boundary events: problems, progress, possibilities|language=en|volume=244|issue=1|pages=281–289|doi=10.1016/j.palaeo.2006.06.042|bibcode=2007PPP...244..281W |issn=0031-0182}} In 2007, an exposure of the Gabbs Formation at [New York Canyon](/source/New_York_Canyon%2C_Nevada) was proposed a candidate [GSSP](/source/Global_Boundary_Stratotype_Section_and_Point) for the [Hettangian stage](/source/Hettangian), the first stage of the Jurassic.{{Cite journal|last1=McRoberts|first1=Christopher A.|last2=Ward|first2=Peter D.|last3=Hesselbo|first3=Stephen|date=July 2007|title=A proposal for the base Hettangian Stage (= base Jurassic System) GSSP at New York Canyon (Nevada, USA) using carbon isotopes|url=https://www.researchgate.net/publication/46697242|journal=International Subcommission on Jurassic Stratigraphy|volume=34|issue=1|pages=43–39}} However, the New York Canyon section was ultimately not selected as Hettangian GSSP, which instead went to the Kuhjoch section ([Kendlbach Formation](/source/Kendlbach_Formation)) of [Austria](/source/Austria) in 2010.{{cite journal|last1=Hillebrandt|first1=A.v.|last2=Krystyn|first2=L.|last3=Kürschner|first3=W.M.|last4=Bonis|first4=N.R.|last5=Ruhl|first5=M.|last6=Richoz|first6=S.|last7=Schobben|first7=M. A. N.|last8=Urlichs|first8=M.|last9=Bown|first9=P.R.|last10=Kment|first10=K.|last11=McRoberts|first11=C.A.|date=September 2013|title=The Global Stratotype Sections and Point (GSSP) for the base of the Jurassic System at Kuhjoch (Karwendel Mountains, Northern Calcareous Alps, Tyrol, Austria)|journal=Episodes|volume=36|issue=3|pages=162–198|citeseerx=10.1.1.736.9905|doi=10.18814/epiiugs/2013/v36i3/001|first13=A|last13=Tomãsových|first12=M.|last12=Simms|doi-access=free }} == Fossil content == The Gabbs Formation hosts several diverse assemblages of [ammonite](/source/ammonite)s, [bivalves](/source/bivalves), and other invertebrates. In 2021, several ammonites were newly described from the formation:{{cite journal|last1=Taylor |first1=D. |last2=Guex |first2=J. |last3=Lucas |first3=S. G. |year=2021 |title=Ammonoids of the latest Triassic Gabbs Formation at New York Canyon, Mineral County, Nevada |url=https://www.researchgate.net/publication/348002169 |journal=[New Mexico Museum of Natural History and Science Bulletin](/source/New_Mexico_Museum_of_Natural_History_and_Science_Bulletin) |volume=82 |pages=393–425}} * ''[Arcestes lawsi](/source/Arcestes)'' * ''[Paracochloceras nunminensis](/source/Paracochloceras)'' * ''[Peripleurites gabbensis](/source/Peripleurites)'' * ''[Placites heggi](/source/Placites)'' * ''[Rhacophyllites mulleri](/source/Rhacophyllites)'' * ''[R. volcanoensis](/source/Rhacophyllites)'' == See also == {{commons category|Gabbs Formation}} * [List of fossiliferous stratigraphic units in Nevada](/source/List_of_fossiliferous_stratigraphic_units_in_Nevada) * [Paleontology in Nevada](/source/Paleontology_in_Nevada) == References == {{reflist}} Category:Geologic formations of Nevada Category:Triassic System of North America Category:Norian Stage Category:Rhaetian Stage Category:Jurassic System of North America Category:Hettangian Stage Category:Limestone formations of the United States Category:Mudstone formations of the United States Category:Siltstone formations of the United States Category:Shallow marine deposits Category:Open marine deposits Category:Paleontology in Nevada --- Adapted from the Wikipedia article [Gabbs Formation](https://en.wikipedia.org/wiki/Gabbs_Formation) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Gabbs_Formation?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.