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
- ↑ García A., Floreal (1968). Ceccioni, Giovanni, ed. El Terciario de Chile Zona Central (in Spanish). Santiago de Chile: Ediorial Andrés Bello. pp. 25–57.
- 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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