Santo Domingo Formation
Santo Domingo Formation (Spanish: Formación Santo Domingo) is a mainly marine Miocene sedimentary formation located in south–central Chile. The formation was defined by R. Martínez Pardo and Mario Pino in 1979 and named after the roadcut locality they studied about 19 kilometres (12 mi) southeast of Valdivia. Sediments of the formation accumulated in Valdivia and Osorno–Llanquihue Basin.
| Santo Domingo Formation | |
|---|---|
| Stratigraphic range: Miocene | |
| Type | Geological formation |
| Underlies | Pliocene and Quaternary sediments including Caleta Godoy Formation |
| Overlies | Bahía Mansa Metamorphic Complex, Cretaceous granitoids, Cheuquemó Formation, Estratos de Pupunahue |
| Thickness | Up to 110 m (360 ft) at surface 1,500 m (4,900 ft) in subsurface |
| Lithology | |
| Primary | Sandstone, siltstone, mudstone |
| Other | Conglomerate |
| Location | |
| Coordinates | 40.0°S 73.0°W |
| Region | Los Ríos & Los Lagos Regions |
| Country | Chile |
| Extent | Osorno–Llanquihue & Valdivia Basins |
| Type section | |
| Named for | Cuesta Santo Domingo |
| Named by | Martínez Pardo & Pino |
| Year defined | 1979 |
Santo Domingo Formation (Chile) Location of type section in Chile | |
The formations overlie a basement consisting of metamorphic and igneous rocks, the Bahía Mansa Metamorphic Complex and Cretaceous granitoids, respectively. In parts, it further overlies the coal–bearing Pupunahue–Catamutún Formation. The sedimentary facies of the Santo Domingo Formation are composed of sandstone, siltstone, and mudstone with smaller amounts of conglomerate. The formation underlies Pliocene and Quaternary sediments.