Gamoneda Formation
| Gamoneda Formation | |
|---|---|
| Stratigraphic range: Emsian ~ | |
| Type | Geological formation |
| Thickness | ~340 m (1,120 ft) |
| Lithology | |
| Primary | Sandstone, siltstone |
| Other | Shale |
| Location | |
| Coordinates | 21°30′S 64°48′W / 21.5°S 64.8°W |
| Approximate paleocoordinates | 66°30′S 98°24′W / 66.5°S 98.4°W |
| Region | Tarija Department |
| Country |  Bolivia |
| Extent | Cordillera Oriental |
| Type section | |
| Named for | La Gamoneda |
  Gamoneda Formation (Bolivia) | |
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]
Fossil content
[edit]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.
See also
[edit]References
[edit]- ^ 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
[edit]- 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