Ranquil Formation
Miocene and Pliocene sedimentary formation in south-central Chile / From Wikipedia, the free encyclopedia
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The Ranquil Formation (Spanish: Formación Ranquil) is a Miocene and Pliocene sedimentary formation located in Arauco Province in south–central Chile, including outcrops in Mocha Island. The formation has its greatest thicknesses in the south-west, where its sediments were largely deposited in marine conditions. It overlies unconformably sedimentary formations of the Paleocene-Eocene Lebu Group.[1] The formation is part of the fill of Arauco Basin which is a sedimentary basin that extends south of Concepción.[2]
Ranquil Formation | |
---|---|
Stratigraphic range: Miocene–Pliocene | |
Type | Geological formation |
Underlies | Tubul Formation |
Overlies | Lebu Group |
Lithology | |
Primary | Conglomerate with clay and silt matrix, breccia, sandstone, siltstone, mudstone |
Other | Conglomerate with sand matrix |
Location | |
Coordinates | 37.6°S 73.7°W / -37.6; -73.7 |
Approximate paleocoordinates | 37.9°S 71.4°W / -37.9; -71.4 |
Region | Bío Bío Region |
Country | Chile |
Type section | |
Named for | Caleta Ranquil |
Named by | Juan Tavera |
Year defined | 1942 |
Macrofossils of the formation are similar to those of Navidad (34° S) and Lacui Formations (43° S), two nearby Miocene marine formations.[3]
The base of the Ranquil Formation is the so-called "main unconformity", which is thought to have been formed by erosion during a period of tectonic inversion.[4]
The formation was first defined in 1942 by Juan Tavera.[1]