Lacui Formation
Marine Miocene sedimentary formation in Chiloé Island
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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]
OverliesAncud Volcanic Complex
RegionChiloé Island (Los Lagos Region)
| Lacui Formation | |
|---|---|
| Stratigraphic range: Serravallian (Laventan) ~ | |
| 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]