Soncco Formation
Geologic formation in Peru
title: "Soncco Formation" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["geologic-formations-of-peru", "paleogene-peru", "eocene-series-of-south-america", "oligocene-series-of-south-america", "tinguirirican", "divisaderan", "mustersan", "rupelian-stage", "priabonian-stage", "conglomerate-formations", "coal-formations", "limestone-formations", "sandstone-formations", "lacustrine-deposits", "fossiliferous-stratigraphic-units-of-south-america", "paleontology-in-peru", "geography-of-the-department-of-cusco", "geography-of-the-department-of-puno"] description: "Geologic formation in Peru" topic_path: "philosophy" source: "https://en.wikipedia.org/wiki/Soncco_Formation" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Geologic formation in Peru ::
::data[format=table title="Infobox rockunit"]
| Field | Value |
|---|---|
| name | Soncco Formation |
| type | Geological formation |
| age | Late Eocene-Early Oligocene |
| | period | Oligocene | | prilithology | Conglomerate, sandstone | | otherlithology | Coal, lacustrine limestone | | namedfor | Soncco | | region | Puno & Cusco Regions | | country | Peru | | coordinates | | | unitof | San Jerónimo Group | | subunits | C, D & E Members | | underlies | Punacancha Fm., Tinajani Fm. | | overlies | K'ayra Formation | | thickness | 1600 m | | map | Blakey 035Ma - COL.jpg | | map_caption | Paleogeography of Northern South America, 35 Ma by Ron Blakey | ::
| name = Soncco Formation | image = | caption = | type = Geological formation | age = Late Eocene-Early Oligocene
| period = Oligocene | prilithology = Conglomerate, sandstone | otherlithology = Coal, lacustrine limestone | namedfor = Soncco | namedby = | region = Puno & Cusco Regions | country = Peru | coordinates = | unitof = San Jerónimo Group | subunits = C, D & E Members | underlies = Punacancha Fm., Tinajani Fm. | overlies = K'ayra Formation | thickness = 1600 m | extent = | area = | map = Blakey 035Ma - COL.jpg | map_caption = Paleogeography of Northern South America, 35 Ma by Ron Blakey | AlternativeMap = Peru physical map.svg | width = 330 | lat_deg = -13.336706 | lon_deg = -71.741044 | label = | float = right | position = right | mark = Orange pog.svg | marksize = 10 | caption = Type locality of the Soncco Formation in Peru The 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. In other places the Tinajani Formation overlies the Soncco Formation. The formation has a thickness of 1600 m.
Misattributed ornithopod tracks
The formation was first dated to the Cretaceous, and fossil ornithopod tracks had been reported. Over 9,000 fossil tracks are said to be found within this formation. As the formation has been dated to the Paleogene, the tracks could not be attributed to dinosaurs.
References
Bibliography
References
- Carlotto, 2016, p.522
- La Torre et al., 2004, p.116
- Cusco.gob, 2015, p.120
- Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
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