Soncco Formation
Soncco Formation | |
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Stratigraphic range: Late Eocene-Early Oligocene 43–30 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |
Type | Geological formation |
Unit of | San Jerónimo Group |
Sub-units | C, D & E Members |
Underlies | Punacancha Fm., Tinajani Fm. |
Overlies | K'ayra Formation |
Thickness | 1,600 m (5,200 ft) |
Lithology | |
Primary | Conglomerate, sandstone |
Other | Coal, lacustrine limestone |
Location | |
Coordinates | 13°20′12″S 71°44′28″W / 13.33667°S 71.74111°W / -13.33667; -71.74111 |
Region | Puno & Cusco Regions |
Country | ![]() |
Type section | |
Named for | Soncco |
![]() Paleogeography of Northern South America, 35 Ma by Ron Blakey |
![Soncco Formation is located in Peru](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Peru_physical_map.svg/330px-Peru_physical_map.svg.png)
![Soncco Formation](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/Orange_pog.svg/10px-Orange_pog.svg.png)
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Type locality of the Soncco Formation in PeruThe Soncco Formation is a Late Eocene to Early Oligocene geologic formation in southern Peru. The base of the formation at the contact with the K'ayra Formation is dated using fission track analysis at 43 Ma and the top, the contact with the Punacancha Formation, at 30 Ma.[1] In other places the Tinajani Formation overlies the Soncco Formation.[2] The formation has a thickness of 1,600 metres (5,200 ft).[3]
Misattributed ornithopod tracks
The formation was first dated to the Cretaceous, and fossil ornithopod tracks had been reported.[4] Over 9,000 fossil tracks are said to be found within this formation.[citation needed] As the formation has been dated to the Paleogene, the tracks could not be attributed to dinosaurs.[1]
References
Bibliography
- N., N (2015), Plan de desarrollo urbano Cusco al 2023 (PDF), Cusco.gob, pp. 116–150, retrieved 2017-06-05
- Latorre, O. Omar; Orós, F. Yovani; Sempere, Thierry; Fornari, Michel; Carlotto, Víctor (2004), "Estratigrafía y evolución paleógena del área de Llalli-Macarí (Departamento de Puno)", SGP, 5: 111–119, retrieved 2017-06-05
- Carlotto, Víctor (2016), Dataciones por trazas de fisión en los depósitos continentales terciarios de la Región de Cusco, XIII Congreso Peruano de Geología, pp. 521–524, retrieved 2017-06-05
- Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21