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 |  |
| Extent | Cordillera Oriental |
| Type section | |
| Named for | La Gamoneda |
  Gamoneda Formation (Bolivia) | |
Fossil content
Early Devonian (400 Ma)
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.
gollark: It's right to transmit, not literally all control over that frequency ever.
gollark: It seems strange to sell off fundamental properties of reality, but spectrum is actually quite scarce for many uses.
gollark: You see, the government sells off portions of the electromagnetic spectrum for profit, and the 2.4GHz-ish region is one of the "ISM bands" for which basically-arbitrary use is permitted at no cost.
gollark: This is because of radio licensing.
gollark: Interestingly, the micro:bits actually use the same frequency range as WiFi and possibly "microwaves" in the sense of the big food-warming boxes.
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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