Tubul Formation
Tubul Formation is an Early Pleistocene 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, Quiriquina and the Lebu Group.
Mollusc fossils found in the formation derives from soft-bed environments. Evidence from the fossil mollusc fauna of the Tubul Formation seem to indicate that local water temperatures 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.
