CENPES 648-1: Hirnantian, Paraguay
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Rhynchonellata
- Orthida
- Heterorthidae
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Clarkeia antisiensis
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= Arenorthis paranaensis
Benedetto et al. 2013
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Benedetto et al. 2013 | ||||||
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Rhynchonellata
- Rhynchonellida
- Trigonirhynchiidae
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Heterorthella freitana
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= ? Plectothyrella itacurubiensis
Benedetto et al. 2013
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Benedetto et al. 2013 | ||||||
| see common names | |||||||
Geography
| Country: | Paraguay |
| Coordinates: | 25.4° South, 57.3° West (view map) |
| Paleocoordinates: | 43.0° South, 142.9° West |
| Basis of coordinate: | based on political unit |
| Geographic resolution: | small collection |
Time
| Period: | Ordovician | Epoch: | Late/Upper Ordovician |
| Stage: | Hirnantian | 10 m.y. bin: | Ordovician 5 |
| Key time interval: | Hirnantian | Graptolite zone: | Normalograptus persculptus |
| Age range of interval: | 445.20000 - 443.80000 m.y. ago |
Stratigraphy
| Geological group: | Itacurubi | Formation: | Eusebio Ayala | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Ayala Sst thought to be about same age as Vargas Pena Shale, which is thought to be latest middle Llandovery, Monograptus convolutus Zone. Harrington (1972) had interpreted the VP Shale as early Llandovery.
Benedetto et al. (2013) redate this as Hirnantian. | |||||
Lithology and environment
| Primary lithology: | micaceous,shelly/skeletal,red or brown argillaceous sandstone |
| Includes fossils? | Y |
| Lithology description: "The fossils occur in slabs of micaceous, red-weathering, very shelly, argillaceous sandstone, with bedding thicknesses in the decimetric range, that crop out in situ at ground level...Horizontal, parallel bedding is the only sedimentary structure observed in the poorly exposed Sst." | |
| Environment: | marine indet. |
| Geology comments: Parana Basin. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | paleoecologic analysis |
| Collection method comments: See location details. | |
Metadata
| Database number: | 152549 | ||
| Authorizer: | P. Wagner | Enterer: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2013-11-25 15:05:40 | Last modified: | 2013-11-25 15:05:40 |
| Access level: | the public | Released: | 2013-11-25 15:05:40 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 7034. | A. J. Boucot, J. H. G. Melo, E. V. Santos Neto and S. Wolff. 1991. First Clarkeia and Heterorthella (Brachiopoda; Lower Silurian) occurrence from the Parana Basin in eastern Paraguay. Journal of Paleontology 65(3):512-514 [M. Foote/M. Foote/M. Foote] |
Secondary references:
| 49109 | J. L. Benedetto, K. Halpern, and J. C. Galeano Inchausti. 2013. High-latitude Hirnantian (latest Ordovician) brachiopods from the Eusebio Ayala Formation of Paraguay, Paraná Basin. Palaeontology 56(1):61-78 [P. Wagner/P. Wagner] |