Proveedora Fm., Cerro Rajon, Caborca Region, Mexico - Stewart et. al 1984: Dyeran, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Lingulata
- Lingulida
- Obolidae
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Lingulella sp.
Salter 1866
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rare category | |||||||||
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Trilobita
- Redlichiida
- Wanneriidae
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? Wanneria sp.
Walcott 1910
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| * | ||||||||||
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unclassified
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Skolithos sp.
Haldemann 1840
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| see common names | ||||||||||
Geography
| Country: | Mexico |
| Coordinates: | 30.4° North, 111.9° West (view map) |
| Paleocoordinates: | 4.3° South, 102.8° West |
Time
| Period: | Cambrian | Epoch: | Series 2 |
| 10 m.y. bin: | Cambrian 2-3 | ||
| *Period: | Early/Lower Cambrian - Middle Cambrian | *Epoch: | Caerfai |
| *International age/stage: | Late/Upper Lenian | *Local age/stage: | Late/Upper Dyeran |
| Key time interval: | Dyeran | ||
| Age range of interval: | 514.80000 - 511.00000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Bonnia-Olenellus | Formation: | Proveedora | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: All lithology/stratigraphic details are based primarily on exposures of rocks in the Cerro Rajon area. Unit is 201m thick. Formation creates a conspicuous ridge or ledge in most areas. | |||||
Lithology and environment
| Primary lithology: | "cross stratification",planar lamination,gray,red or brown lithified sandstone |
| Secondary lithology: | lithified siltstone |
| Lithology description: Quartzite, pinkish gray, fine to medium grained, scattered coarse grains, laminated to very thin bedded; common very thin tabular planar sets of low angle cross strata. Abundant Skolithos in lower 90m. Sparse micaceous siltstone layers in lower 83m. | |
| Environment: | transition zone/lower shoreface |
| Geology comments: Represents a southern extension of the Cordilleran miogeocline, rocks may be offset 700 to 800km along a left- lateral fault. | |
Taphonomy
| Modes of preservation: | trace |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Collection methods: | bulk,field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 10683 | ||
| Authorizer: | M. Patzkowsky | Enterer: | P. Borkow |
| Modifier: | A. Krug | Research group: | marine invertebrate |
| Created: | 2001-06-11 12:06:41 | Last modified: | 2003-07-18 18:01:39 |
| Access level: | the public | Released: | 2001-06-11 12:06:41 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 3951. | J. Stewart, M. A. S. McMenamin, and J. M. Morales-Ramirez. 1984. Upper Proterozoic and Cambrian rocks in the Caborca Region, Sonora, Mexico - physical stratigraphy, biostratigraphy, paleocurrent studies, and regional relations. U. S. Geological Survey Professional Papers (1309)1-33 [M. Patzkowsky/P. Borkow] |