Gabbs Formation

{{Short description|Geologic formation in Nevada, United States}}

{{Infobox rockunit

| name = Gabbs Formation

| image =

| caption =

| type = Formation

| age = Norian-Hettangian
~{{fossil range|225|199}}

| period = Rhaetian

| prilithology = Siltstone, limestone

| otherlithology = Mudstone

| namedfor = Gabbs Valley Range

| namedby = Muller & Ferguson

| year_ts = 1939

| region = Nevada

| country = 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

| subunits = Nun Mine, Mount Hyatt & Muller Canyon Members

| underlies = Sunrise Formation

| overlies = 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 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.{{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 was proposed a candidate GSSP for the Hettangian stage, 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) of 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 }}