‘‘Rincon", ‘‘Escuela Seccional de Puesto Grande’’, Tarija [Pircancha Fm]: Moridunian, Bolivia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Agnatha
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Pircanchaspis rinconensis n. sp.
Erdtmann et al. 2000
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Pterobranchia
- Graptoloidea
- Dichograptidae
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Didymograptus cf. suecicus
Tullberg 1880
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Pterobranchia
- Graptoloidea
- Phyllograptidae
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Tetragraptus cf. amii
Elles and Wood 1902
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Pseudophyllograptus densus
(Tornquist 1879)
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Pterobranchia
- Graptoloidea
- Didymograptidae
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Baltograptus deflexus
(Elles and Wood 1901)
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Baltograptus minutus
(Törnquist 1879)
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| see common names | |||||||
Geography
| Country: | Bolivia |
| Coordinates: | 21.2° South, 65.1° West (view map) |
| Paleocoordinates: | 32.5° South, 164.6° West (Wright 2013) |
| Basis of coordinate: | estimated from map |
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician | Epoch: | Early Ordovician |
| Stage: | Floian | 10 m.y. bin: | Ordovician 2 |
| Key time interval: | Moridunian | Graptolite zone: | Baltograptus deflexus |
| Age range of interval: | 477.7 - 474.3 m.y. ago |
Stratigraphy
| Formation: | Pircancha | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Pircancha Fm, for which lithostratigraphic relations are not discussed. AGE: Lower Arenig, on the basis of graptolite biostratigraphy. STRATIGRAPHIC POSITION: From the basal 150 m of the about 1,800 m thick lower
formation. JA: switched from Arenig to Moridunian because age is specifically given as "early Arenig (Moridunian)" | |||||
Lithology and environment
| Primary lithology: | brown,green silty mudstone |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Greenish-brown weathered silty mudstone. LITHIFICATION: Unknown. | |
| Environment: | offshore |
| Geology comments: ENVIRONMENT: Open shelf environment; deposition below wave base, but above storm wave base. The apparent lack of benthic fossils combined with rather rare occurrences of trace fossils is interpreted as being due to high depositional rates, unsupportive muddy substrates, cold climate, and oxygen deficiency as mentioned above. | |
Taphonomy
| Modes of preservation: | body,replaced with pyrite |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | MfN |
| Collection method comments: COLLECTOR: Not stated in text. REPOSITORY: Museum für Naturkunde, Humboldt-Universität, Berlin. | |
| Taxonomic list comments:COVERAGE: Exhaustive for macrofossils and vertebrates. NOMENCLATURE: Authoritative publication with modern nomenclature and species-resolution identifications. | |
Metadata
| Database number: | 90413 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | J. Alroy | Research group: | marine invertebrate,vertebrate |
| Created: | 2009-07-19 10:37:59 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2009-07-19 10:37:59 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 30374. | B.-D. Erdtmann, B. Weber, H.-P. Schultze and S. Egenhoff. 2000. A possible agnathan plate from the lower Arenig (Lower Ordovician) of South Bolivia. Journal of Vertebrate Paleontology 20(2):394-399 [A. Hendy/A. Hendy] |