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Pan de Azúcar Formation

Coordinates: 25°36′S 70°30′W / 25.6°S 70.5°W / -25.6; -70.5
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Pan de Azúcar Formation
Stratigraphic range: Hettangian-Sinemurian
~201–191 Ma
TypeGeological formation
UnderliesLa Negra Formation
OverliesCifuncho Formation
Thickness700 m (2,300 ft)
Lithology
PrimarySandstone, tuff, mudstone, limestone
Location
Coordinates25°36′S 70°30′W / 25.6°S 70.5°W / -25.6; -70.5
RegionAntofagasta Region
Country Chile
Pan de Azúcar Formation is located in Chile
Pan de Azúcar Formation
Pan de Azúcar Formation (Chile)

Pan de Azúcar Formation (Spanish: Formación Pan de Azúcar, Sugar-loaf formation) is a geologic formation of HettangianSinemurian (Jurassic) age made up of chiefly by sandstone, tuff, mudstone and limestone. The formation is located in the Coast Range of northern Chile. The formation interdigitates and is coeval with the Posada de los Hidalgo Formation. It concordantly overlies the Cifuncho Formation and is overlain by the La Negra Formation.[1]

At least one location the formation is intruded by a roughly coeval dacite dyke which adds to the evidence that the formation was coeval with the early stages of "Andean" volcanism.[1]

References

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  1. ^ a b Suárez, Manuel; Naranjo, José A.; Puig, Álvaro (1985). "Estratigrafía de la Cordillera de la Costa, al sur de Taltal, Chile: Etapas iniciales de la evolución andina". Revista Geológica de Chile (in Spanish). 24: 19–28. Retrieved 16 August 2016.