Ayacara Formation

The Ayacara Formation is a sedimentary formation made up of interbedded sand and siltstone cropping out around Hornopirén and Ayacara Peninsula in western Los Lagos Region, Chile. Less common rocks are tuff and conglomerate. The formation dates to the Early and Middle Miocene (no earlier than 21.8–17.6 million years ago) when it deposited during a marine transgression.^[1]

Ayacara Formation
Stratigraphic range: Early–Middle Miocene ~21.8–17.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Thickness	at least 800 m (2,600 ft)
Lithology
Primary	Sandstone, siltstone, conglomerate
Location
Coordinates	42.313205°S 72.651125°W / -42.313205; -72.651125
Region	Los Lagos Region
Country	Chile
Type section
Named by	Levi et al., 1966
Ayacara Formation (Chile)

See also

• Geology of Chile
• Chaicayán Group
• La Cascada Formation
• Puduhuapi Formation
• Vargas Formation