View source for Earth:Tristel Formation

{{Short description|Geologic formation of the northern-central Alps}}
{{Infobox rockunit
| name           = Tristel Formation
| period         = Aptian
| age            = [[Earth:Barremian|Late Barremian]]-[[Earth:Aptian|Early Aptian]]<br />~{{fossil range|127|123}}
| image          = Naafkopf from SW.JPG
| imagesize      = 
| caption        = Tristel Formation near its type locality, looking at Naafkopf from the southwest
| type           = [[Earth:Geological formation|Geological formation]]
| prilithology   = [[Earth:Limestone|Limestone]], [[Earth:Marl|marl]]
| otherlithology = [[Chemistry:Shale|Shale]]
| namedfor       = Tristel, a mountain next to the Naafkopf
| namedby        = Schwizer
| year_ts        = 1984
| region         = Allgäu, Oberbayern, Tirol, Vorarlberg
| country        = {{AUT}}<br />{{GER}}<br />{{LIE}}<br />{{SWI}}
| coordinates    = {{Coord|47.060767|N|9.607067|E|display=title,inline}}
| unitof         = Rhenodanubic Group, Bündnerschiefer
| subunits       = 
| underlies      = 
| overlies       = 
| thickness      = {{convert|150|-|250|m|ft|abbr=on}}<ref name=bgr-Tristel-Formation />
| extent         = 
| area           = 
| map            = 
| map_caption    = 
}}
The '''Tristel Formation''' is a stratigraphic formation of the northern-central [[Place:Alps|Alps]], deposited between the [[Earth:Barremian|late Barremian]] and the [[Earth:Aptian|early Aptian]] of the [[Earth:Early Cretaceous|Early Cretaceous]]. It consists of thickly banked [[Earth:Limestone|limestone]]s, [[Earth:Marl|marl]]s and [[Chemistry:Shale|shale]]s.<ref name=bgr-Tristel-Formation>{{cite web|title=Tristel-Formation|url=http://www.bgr.de/app/litholex/gesamt_ausgabe_neu.php?id=2008131|work=Lithostratigraphische Einheiten Deutschlands}}</ref> It is the lowest formation of the Bündnerschiefer and belongs to the Rhenodanubic Group.<ref name="Tricart 2010">{{cite book|last=Tricart|first=Pierre-Charles de Graciansky, David G. Roberts, Pierre|title=The Western Alps, from rift to passive margin to orogenic belt : an integrated geoscience overview|year=2010|publisher=Elsevier|location=Amsterdam|isbn=978-0444537249|edition=1st|page=158}}</ref>

Outcrops can be found in the Engadin window, the Tauern window, the Rechnitz window, and many localities of the [[Earth:Penninic|Penninic]] realm of the eastern and western Alps.<ref name=stratchart-austria>{{cite web |url=http://palstrat.uni-graz.at/Stratigraphische_Tabelle_von_Oesterreich_2004.pdf |archive-url=https://web.archive.org/web/20070930140236/http://palstrat.uni-graz.at/Stratigraphische_Tabelle_von_Oesterreich_2004.pdf |title=Stratigraphische Tabelle von Österreich |lang=de-at |date=2004|archive-date=30 September 2007|accessdate=2023-05-28}}</ref>

The type locality is the area around the Naafkopf ({{Coord|47.060767|N|9.607067|E|display=inline}}) in the border region of Austria, [[Finance:Liechtenstein|Liechtenstein]] and {{wipe|Switzerland}}.<ref name=bgr-Tristel-Formation />

The Tristel Formation can be correlated with the Klus Formation in Graubünden and the Couches de l’Aroley Formation in Savoie ({{wipe|France}}) and Valais ({{wipe|Switzerland}}).<ref name="Loprieno 2011">{{cite journal|last=Loprieno|first=Andrea|title=The Valais units in Savoy (France): a key area for understanding the palaeogeography and the tectonic evolution of the Western Alps|journal=International Journal of Earth Sciences |year=2011|volume=100 |issue=5 |page=963 |doi=10.1007/s00531-010-0595-1 |bibcode=2011IJEaS.100..963L |hdl=20.500.11850/37751 |s2cid=56379732 |hdl-access=free }}</ref><ref name="Tricart 2010_2">{{cite book|last=Tricart|first=Pierre-Charles de Graciansky, David G. Roberts, Pierre|title=The Western Alps, from rift to passive margin to orogenic belt : an integrated geoscience overview|year=2010|publisher=Elsevier|location=Amsterdam|isbn=978-0444537249|edition=1st|page=153}}</ref>

== References ==
{{Reflist}}

[[Category:Aptian Stage]]
[[Category:Limestone formations]]
[[Category:Shale formations]]

{{Sourceattribution|Tristel Formation}}