Cheuquemó Formation

Cheuquemó Formation (Spanish: Formación Cheuquemó) is a geological formation of sedimentary rock in south-central Chile. The sediments of the formation were deposited during the Late Oligocene and Early Miocene epochs. The formations lower sections are made up of conglomerate, then successions of sandstone, tuff and mudstone rich in organic material follows. The formation indicates that sedimentation occurred in an estuarine (paralic) and other non-marine (continental) environments. It contains fossils of the following genera: Mytilus, Cardium and Turritella. Stratigraphically it overlies the Bahía Mansa Metamorphic Complex and underlies the Miocene Santo Domingo Formation.^[1]

Cheuquemó Formation
Stratigraphic range: Late Oligocene–Early Miocene
Unit of	Osorno–Llanquihue Basin
Underlies	Santo Domingo Formation
Overlies	Bahía Mansa Metamorphic Complex
Thickness	more than 1,200 m (3,900 ft)
Lithology
Primary	Conglomerate, sandstone, mudstone, tuff
Other	Coal
Location
Coordinates	40.0°S 73.0°W / -40.0; -73.0
Region	Los Lagos Region
Country	Chile
Type section
Named by	Floreal García
Year defined	1968
Cheuquemó Formation (Chile)

Description

The formation is very similar to the Pupunahue Beds found further north, with the sole difference that the fossil assemblage in both seem to indicate different ages. While Cheuquemó is possibly about 14 million years old (Miocene), the Pupunahue Beds are 35–25 million years old.^[2]

See also

• Coal mining in Chile