Tubul Formation

Tubul Formation
Stratigraphic range: Pliocene
Type Geological formation
Underlies Quaternary sediments
Overlies Ranquil Formation
Thickness >100 m
Lithology
Primary Clay-rich sandstone and silt
Location
Region Bío Bío Region
Country Chile
Type section
Named for Caleta Tubul
Named by Egidio Feruglio, 1949

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).[1]

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.[2]

The formation was first defined by Egidio Feruglio in 1949.[2]

See also

References

  1. García A., Floreal (1968). Ceccioni, Giovanni, ed. El Terciario de Chile Zona Central (in Spanish). Santiago de Chile: Ediorial Andrés Bello. pp. 25–57.
  2. 1 2 Valdovinos, Claudio; Nielsen, Sven N. (2006). "Mollusks if the Tubul Formation (South-Central Chile): Implications for the Early Pleistocene climate of the Southeastern Pacific" (PDF). XI Congreso Geológico Chileno. II. pp. 135–138.
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