Buelna Fm., Cerro Rajon, Caborca Region, Mexico - Stewart et. al 1984: Dyeran, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Hormogoneae
- Oscillatoriales
- Girvanellaceae
|
||||||||||
Girvanella sp.
Nicholson and Etheridge 1878
|
||||||||||
Girvanella mexicana
Cooper et al. 1952
|
||||||||||
unclassified
|
||||||||||
Olenllus truemani
|
||||||||||
Salterellidae
|
||||||||||
Salterella sp.
Billings 1861
|
||||||||||
Salterella cf. pulchella
Billings 1861
|
||||||||||
Salterella maccullochi
(Murchison 1859)
|
||||||||||
Archaeocyatha
- Archaeocyathida
- Archaeopharetridae
|
||||||||||
Protopharetra sp.
Bornemann 1884
|
||||||||||
Archaeocyatha
- Capsulocyathida
- Coscinocyathidae
|
||||||||||
Coscinocyathus sp.
Bornemann 1884
|
||||||||||
Tergomya
- Scenellidae
|
||||||||||
Scenella cf. reticulata
Billings 1872
|
||||||||||
Paterinata
- Paterinida
- Paterinidae
|
||||||||||
Paterina sp.
Beecher 1891
|
||||||||||
Hyolithida
- Hyolithidae
|
||||||||||
Hyolithes whitei
Resser 1938
|
||||||||||
recombined as Nevadotheca whitei | ||||||||||
Hyolithes sp.
d'Eichwald 1840
|
||||||||||
Orthothecida
- Orthothecidae
|
||||||||||
Orthotheca buelna
Lochman 1952
|
||||||||||
Trilobita
- Redlichiida
|
||||||||||
Olenelloidea indet.
Walcott 1890
|
||||||||||
Trilobita
- Redlichiida
- Olenellidae
|
||||||||||
Olenellus puertoblancoensis
(Lochman 1952)
|
||||||||||
recombined as Olenellus (Paedeumias) puertoblancoensis | ||||||||||
Olenellus fremonti
Walcott 1910
|
||||||||||
recombined as Mesonacis fremonti | ||||||||||
Trilobita
- Redlichiida
- Wanneriidae
|
||||||||||
Wanneria sp.
Walcott 1910
|
||||||||||
Wanneria walcottana
(Wanner 1901)
|
||||||||||
Trilobita
- Corynexochida
- Dorypygidae
|
||||||||||
Bonnia sonora
Lochman 1952
|
||||||||||
Trilobita
- Antagmidae
|
||||||||||
Onchocephalus mexicanus
Lochman 1952
|
||||||||||
Onchocephalus buelnaensis
Lochman 1952
|
||||||||||
Sombrerella mexicana
Lochman 1948
|
||||||||||
Antagmus solitarius
Lochman 1952
|
||||||||||
Antagmus buttsi
(Resser 1939)
|
||||||||||
unclassified
|
||||||||||
Cruziana sp.
d'Orbigny 1842
|
||||||||||
trace fossil | ||||||||||
Palaeophycus sp.
Hall 1847
|
||||||||||
trace fossil | ||||||||||
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: | Early/Lower Cambrian |
10 m.y. bin: | Cambrian 2 | ||
*Period: | Early/Lower Cambrian | *Epoch: | Caerfai |
*International age/stage: | Late/Upper Lenian | *Local age/stage: | Late/Upper Dyeran |
Key time interval: | Dyeran | ||
Age range of interval: | 516.00000 - 513.00000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Geological group: | Bonnia-Olenellus | Formation: | Buelna | ||
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 77.5m thick. Formation creates a conspicuous ridge or ledge in most areas. The broad facies included in the formation and a lack of information regarding the lithology containing the fossils prevents a single paleoenvironment from being selected. |
Lithology and environment
Primary lithology: | gray,green,yellow lithified siltstone |
Secondary lithology: | "cross stratification",planar lamination,brown,yellow lithified sandstone |
Lithology description: Mixed rock types. Siltstone, greenish gray to yellowish gray, coarse silt. Quartzite, yellowish brown, fine to medium grained, laminated and cross stratified. Limestone and dolomite, sandy in parts, light-gray, commonly weathering moderate brown, laminated and cross stratified. | |
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,original calcite |
Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
Collection methods: | bulk,field collection |
Reason for describing collection: | biostratigraphic analysis |
Metadata
Database number: | 10684 | ||
Authorizer: | M. Patzkowsky | Enterer: | P. Borkow |
Modifier: | J. Alroy | Research group: | marine invertebrate |
Created: | 2001-06-11 12:13:21 | Last modified: | 2003-07-10 19:51:10 |
Access level: | the public | Released: | 2001-06-11 12:13:21 |
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] |