Lacui Formation

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]

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)

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