Gamoneda Formation
The Gamoneda Formation is an Emsian geologic formation of southern Bolivia. The approximately 340 metres (1,120 ft) thick formation comprises marine micaceous grey siltstones and burrowed grey sandstones and shales.[1][2][3][4][5]
| Gamoneda Formation Stratigraphic range: Emsian ~409–392 Ma | |
|---|---|
| Type | Geological formation |
| Thickness | ~340 m (1,120 ft) |
| Lithology | |
| Primary | Sandstone, siltstone |
| Other | Shale |
| Location | |
| Coordinates | 21.5°S 64.8°W |
| Approximate paleocoordinates | 66.5°S 98.4°W |
| Region | Tarija Department |
| Country |  Bolivia |
| Extent | Cordillera Oriental |
| Type section | |
| Named for | La Gamoneda |
  Gamoneda Formation (Bolivia) | |
Fossil content
The formation has provided the following fossils:
- Acastoides gamonedensis
- Australocoelia palmata
- Australospirifer hawkinsi
- Australostrophia mesembria
- Bainella (Belenops) insolita
- Cryptonella baini
- Deltacephalaspis (Deltacephalaspis) comis
- Deltacephalaspis (Deltacephalaspis) retrospina
- Deltacephalaspis (Prestalia) tumida
- Derbyina jamesiana
- Gamonedaspis scutata
- Kozlowskiaspis (Romanops) australis
- Notiochonetes falklandica
- Phacopina convexa
- Plicoplasia planoconvexa
- Protoleptostrophia concinna
- Pustulatia curupira
- Schizostylus (Curuyella) granulata
- Tarijactinoides jarcasensis
- Burmeisteria sp.
- cf. Francovichia sp.
- Calmoniidae indet.
- Eurypterida indet.
References
- USNM loc. 20018 at Fossilworks.org
- USNM loc. 20022 at Fossilworks.org
- USNM loc. 20023 at Fossilworks.org
- USNM loc. 20024 at Fossilworks.org
- Scaphiocoelia Zone trilobites, Gamoneda Fm at Fossilworks.org
Further reading
- N. Eldredge and L. Branisa. 1980. Calmoniid trilobites of the Lower Devonian Scaphiocoelia Zone of Bolivia, with remarks on related species. Bulletin of the American Museum of Natural History 165(2):181-289
- P. E. Isaacson. 1977. Devonian stratigraphy and brachiopod paleontology of Bolivia. part A: Orthida and Strophomenida. Palaeontographica Abteilung A 155(5-6):133-192
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