Type Geological formation Thickness >100 m Named for Caleta Tubul Overlies Ranquil Formation | Underlies Quaternary sediments Country Chile Region Bío Bío Region | |
Primary Clay-rich sandstone and silt | ||
Tubul Formation (Spanish: Formación Tubul) is a Pliocene sedimentary formation located in Arauco Province in south–central Chile. Its sediments were deposited in marine conditions. It overlies unconformably the folded sedimentary formations of Ranquil (Miocene–Pliocene), Quiriquina (Late Cretaceous) and the Lebu Group (Paleocene-Eocene).
Mollusc fossils found in the formation derives from soft-bed environments (contrary to rocky coasts). Evidence from the fossil mollusc fauna of Tubul Formation seem to indicate that local water temperatres were lower in the Pliocene than today. Waters and mollusc faunas of Magallanes Region are modern-day equivalents of Tubul Formation.
The formation was first defined by Egidio Feruglio in 1949.
References
Tubul Formation Wikipedia(Text) CC BY-SA