Yacoraite Formation
{{Short description|Geologic formation in Argentina}}
{{Infobox rockunit
| name = Yacoraite Formation
| image =
| caption =
| type = Geological formation
| period = Danian
| age = Maastrichtian-Danian
| prilithology = Sandstone
| otherlithology = Limestone
| namedfor = Yacoraite village, Tilcara Department
| namedby =
| region = Jujuy & Salta Provinces
| country = Argentina
| coordinates = {{coord|23.5|S|65.4|W|display=inline,title}}
| paleocoordinates = {{coord|26.1|S|51.9|W|display=inline}}
| unitof = Salta Group
| subunits = Amblayo, Güemes, Alemanía & Juramento Members
| underlies = Mealla, Olmedo & Tunal Formations
| overlies = Lecho Formation
| thickness =
| extent = Salta Basin
| area =
| map = {{Location map+ | Argentina
| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | Argentina
| lat_deg = -23.5
| lon_deg = -65.4
| mark = Green-orange pog.svg
| marksize = 12
}}
}}
| map_caption =
}}
The Yacoraite Formation is a largely Mesozoic geologic formation. The deposits of this formation mainly date from the Maastrichtian of the Upper Cretaceous, but the Cretaceous–Paleogene boundary (K–T boundary) runs right through this formation near its top, and the uppermost parts are consequently from the Danian (Lower Paleocene). It was probably deposited around the intertidal zone, as the sedimentary rocks of this formation alternate according to sea level changes between deposits of muddy beaches and of shallow ocean.Marquillas et al. (2003)
Fossil content
Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel et al. (2004: pp.517-607)
Well-preserved dinosaur footprints assigned to Hadrosaurichnus australis have been found in this formation, as were fossil eggs, stromatolites and the Mesozoic palynomorph Aquilapollenites.
Other fossils recovered from the formation are:
- Pucapristis branisiLeonardi, 1994, p.30
- Gasteroclupea branisai
- Coelodus toncoensis
- Dolichochampsa minima
;Ichnofossils
See also
References
{{Reflist}}
= Bibliography =
- {{citation |last=Leonardi |first=Giuseppe |year=1994 |title=Annotated Atlas of South America Tetrapod Footprints (Devonian to Holocene) with an appendix on Mexico and Central America |url=https://www.researchgate.net/publication/309643073 |publisher=Ministerio de Minas e Energia - Companhia de Pesquisa de Recursos Minerais, Geological Service of Brazil |pages=1–248 |accessdate=2019-03-25}}
- {{citation |last1=Marquillas |first1=Rosa |last2=del Papa |first2=Cecilia |last3=Sabino |first3=Ignacio |last4=Heredia |first4=Jorge |year=2003 |title=Prospección del límite K/T en la cuenca del Noroeste, Argentina - The K/T boundary prospecting in the Northwest Basin, Argentina |url=https://www.researchgate.net/publication/242245610 |journal=Revista de la Asociación Geológica Argentina |volume=58 |pages=271–274 |accessdate=2019-03-25}}
- {{citation |last1=Weishampel |first1=David B. |author2-link=Peter Dodson |last2=Dodson |first2=Peter |author3-link=Halszka Osmólska |last3=Osmólska |first3=Halszka |year=2004 |title=The Dinosauria, 2nd edition |url=https://books.google.com/books?id=vtZFDb_iw40C |publisher=Berkeley: University of California Press |pages=880 p |accessdate=2019-02-21 |isbn=0-520-24209-2 |author1-link=David B. Weishampel }}
Category:Geologic formations of Argentina
Category:Upper Cretaceous Series of South America
Category:Maastrichtian Stage of South America
Category:Cretaceous–Paleogene boundary
Category:Paleocene Series of South America
Category:Ichnofossiliferous formations
Category:Fossiliferous stratigraphic units of South America
Category:Paleontology in Argentina