Mirador Conglomerates near Tamarindo: Priabonian, Peru
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
- Ampullinidae
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Ampullina bravoensis n. sp.
Olsson 1931
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Ampullinopsis spenceri n. sp.
(Cooke 1919)
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Gastropoda
- Potamididae
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Hannatoma emendorferi n. sp.
Olsson 1931
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Cephalopoda
- Nautilida
- Aturiidae
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Aturia peruviana
(Olsson 1928)
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| Aturia alabamensis var. peruviana (3 measurements) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Peru |
| Coordinates: | 4.9° South, 81.0° West (view map) |
| Paleocoordinates: | 7.4° South, 73.8° West |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Priabonian | 10 m.y. bin: | Cenozoic 3 |
| Key time interval: | Priabonian | ||
| Age range of interval: | 37.71000 - 33.90000 m.y. ago |
Stratigraphy
| Geological group: | Chira | Formation: | Mirador | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Olsson assigned the Mirador Conglomerates to the Mancora Formation (now considered Early Oligocene - Higley, 2004), but Palacios (1994) stated that the Mirador Conglomerate is the middle unit of the Chira Formation, or the middle formation of the Chira Group. The entire area around Tamarindo is mapped as Chira Formation/Group by Palacios (1994), indicating that this locality should be within the Chira Group. The Chira contains diatoms indicative of a latest Eocene age (Marty et al., 1988; Koizumi, 1992), regional Upper Eocene planktonic foraminifera as Hantkenina primitiva, Globigerina mexicana, Globigerina topilensis, and Guembelina venezuelana (Weiss, 1955), and radiolarians of the C. azyx (RP17) or C. bandyca (RP18) zones (Marty, 1989) - all of which indicate a Priabonian age. | |||||
Lithology and environment
| Primary lithology: | coarse sandstone |
| Lithology description: Sandy zones that accompany the Mirador conglomerates. in Olsson. "Coarse-grained whitish sandstones with conglomerate horizons" according to Palacios (1994). | |
| Environment: | coastal indet. |
| Geology comments: Typically described as a shallow-marine facies, but precise environment is uncertain. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 55440 | ||
| Authorizer: | L. Ivany | Enterer: | L. Ivany |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2005-10-23 15:12:58 | Last modified: | 2019-08-21 13:45:58 |
| Access level: | the public | Released: | 2005-10-23 15:12:58 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 14915. | A. A. Olsson. 1931. Contributions to the Tertiary Paleontology of Northern Peru: Part 4, The Peruvian Oligocene. Bulletins of American Paleontology 17(63) [L. Ivany/L. Ivany] |
Secondary references:
| 18631 | D. Higley. 2004. The Talara Basin Province of NW Peru: Cretaceous to Tertiary Total Petroleum System. United States Geological Survey Bulletin 2206(A):1-28 [L. Ivany/L. Ivany] |