Olistolite EM01, San Isidro area: Idamean, Argentina
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Agnostida
- Diplagnostidae
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Pseudagnostus idalis
Opik 1967
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| 6 cephala and 2 pygidia | ||||||||||
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Agnostida
- Agnostidae
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Oncagnostus sp.
Whitehouse 1936
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| 1 cephalon and 1 pygidium | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Argentina | State/province: | Mendoza |
| Coordinates: | 32.9° South, 69.2° West (view map) | ||
| Paleocoordinates: | 39.7° South, 126.4° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Cambrian | Epoch: | Furongian |
| Stage: | Paibian | 10 m.y. bin: | Cambrian 5 |
| *Period: | Late/Upper Cambrian | *Epoch: | Merioneth |
| *International age/stage: | Maentwrogian | *Local age/stage: | Idamean |
| Key time interval: | Idamean | Trilobite zone: | Glyptagnostus reticulatus |
| Age range of interval: | 497 - 494 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Empozada | Formation: | Cerro Pelado | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: Sequence of almost 3,000m thick, Ordovician depositional age, although olistolite is Cambrian. Allochthonous Late Cambrian trilobites occur in dispersed calcareous blocks within lower half of unit. PJW: this should be Cerro Pelado formation now. Overlies San Isidro formation & underlies El Relincho formation. Stigmatoa diloma-Glyptagnostus reticulatus zone | |||||
Lithology and environment
| Primary lithology: | black lithified calcareous "shale" |
| Secondary lithology: | lithified conglomerate |
| Lithology description: black shales with abundant calcareous olistolites, breccias and sandstones. | |
| Environment: | offshore ramp |
| Geology comments: Cambrian material is Precordilleran | |
Taphonomy
| Modes of preservation: | body,original calcite |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: The Bondonaro Collection has been split into six subcollections in order to include the lithology/locality data for individual olistolites. | |
Metadata
| Also known as: | Olistolite EM01, San Isidro area, Mendoza, Argentina - Shergold et. al 1995 | ||
| Database number: | 9930 | ||
| Authorizer: | M. Patzkowsky | Enterer: | P. Borkow |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2001-02-01 12:02:00 | Last modified: | 2019-03-01 14:19:18 |
| Access level: | the public | Released: | 2001-02-01 12:02:00 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 865. | J. H. Shergold, O. Bordonaro, and E. Linan. 1995. Late Cambrian Agnostoid trilobites from Argentina. Palaeontology 38(2):241-257 [M. Patzkowsky/P. Borkow] |