Pan de Azúcar Formation

Pan de Azúcar Formation
Pan de Azúcar Formation
Stratigraphic range: Hettangian-Sinemurian; ~201–191 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	La Negra Formation
Overlies	Cifuncho Formation
Thickness	700 m (2,300 ft)
Lithology
Primary	Sandstone, tuff, mudstone, limestone
Location
Coordinates	25°36′S 70°30′W / 25.6°S 70.5°W
Region	Antofagasta Region
Country	Chile
	Pan de Azúcar Formation (Chile)

Pan de Azúcar Formation (Spanish: Formación Pan de Azúcar, Sugar-loaf formation) is a geologic formation of Hettangian–Sinemurian (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

^ ^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.

[Suarezetal1985-1] 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.

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