Lacui Formation

Lacui Formation
Stratigraphic range: Serravallian (Laventan) ~13.8–11.8 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Overlies	Ancud Volcanic Complex
Location
Coordinates	41°50′S 74°00′W
Region	Chiloé Island (Los Lagos Region)
Country	Chile
Type section
Named for	Lacuy Peninsula
Named by	Valenzuela
Year defined	1982
Lacui Formation (Chile)

Lacui Formation (Spanish: Formación Lacui) is a marine Miocene sedimentary formation located in Chiloé Island with minor outcrops near Carelmapu on the mainland.^[1][2] Gastropod shells are the most common macrofossils of Lacui Formation.^[2] According to Sernageomin (1998) the formation dates to the earliest Serravallian — that is the Middle Miocene.^[2]

South of Lacui Formation there are equivalent sedimentary rocks in the islands of Ipún, Lemo and Stoke.^[3]

See also

• Lacuy Peninsula
• Navidad Formation
• Santo Domingo Formation

References

1. Charrier, R.; Pinto, L.; Rodríguez, M.P. (2007). "Tectonostratigraphic evolution of the Andean Orogen in Chile". In Moreno, Teresa; Gibbons, Wes (eds.). The Geology of Chile. Geological Society of London. pp. 92–96.
2. Finger, Kenneth L. (2013), "Miocene foraminifera from the south-central coast of Chile" (PDF), Micropaleontology, 59 (4–5): 341–492, Bibcode:2013MiPal..59..341F, doi:10.47894/mpal.59.4.01
3. Encinas, Alfonso; Folguera, Andrés; Bechis, Florencia; Finger, Kenneth L.; Zambrano, Patricio; Pérez, Felipe; Benarbé, Pablo; Tapia, Francisca; Riffo, Ricardo; Buatois, Luis; Orts, Darío; Nielsen, Sven N.; Valencia, Victor V.; Cituño, José; Oliveros, Verónica; De Girolamo Del Mauro, Lizet; Ramos, Víctor A. (2018). "The Late Oligocene–Early Miocene Marine Transgression of Patagonia". In Folguera, A.; Contreras Reyes, E.; Heredia, N.; Encinas, A.; Iannelli, S. B.; Oliveros, V.; M. Dávila, F.; Collo, G.; Giambiagi, L.; Maksymowicz, A.; Iglesia Llanos, M.P.; Turienzo, M.; Naipauer, M.; Orts, D.; Litvak, V. D.; Alvarez, O.; Arriagada, C. (eds.). The Evolution of the Chilean-Argentinean Andes. Springer. pp. 443–474. ISBN 978-3-319-67774-3.