Puerto Blanco, Unit 3, Cerro Rajon, Caborca Region, Mexico - Stewart et. al 1984: Montezuman - Atdabanian, Mexico

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Luguella proveedorensis
Linguella sp.
Pelgiellidae indet.
Hyolithida - Hyolithidae
Hyolithes aff. princeps Billings 1872
recombined as Nevadotheca princeps
Obolellata - Obolellida - Trematobolidae
Alisina mexicana
Trilobita - Redlichiida
cf. Nevadia sp. Walcott 1910
Olenelloidea indet. Walcott 1890
unclassified
Microdictyon sp. Bengston et al. 1981
Archaeocyatha - Archaeocyathida - Archaeocyathidae
Archaeocyathus yavorskii (Vologdin 1931)
Archaeocyatha - Archaeocyathida - Syringocnemidae
? Syringocnema sp.
Archaeocyatha - Ajacicyathida - Ajacicyathidae
Ajacicyathus rimouski
Ajacicyathus nevadensis Okulitch 1943
Archaeocyatha - Ajacicyathida - Ethmophyllidae
Ethmophyllum americanum Cooper et al. 1952
Ethmophyllum whitneyi Meek 1868
Ethmophyllum cooperi Cooper et al. 1952
Coeloscleritophora - Chancelloriida - Chancelloriidae
Chancelloria eros Walcott 1920
Hyolithelminthida - Hyolithellidae
Hyolithellus sp. Billings 1872
unclassified
Cruziana sp. d'Orbigny 1842
trace fossil
see common names

Geography
Country:Mexico
Coordinates: 30.4° North, 111.9° West (view map)
Paleocoordinates:6.1° South, 105.0° West
Time
Period:Cambrian Epoch:Series 2
Stage:Stage 3 10 m.y. bin:Cambrian 2
*Period:Early/Lower Cambrian *Epoch:Caerfai
*International age/stage:Early/Lower Atdabanian - Middle Atdabanian *Local age/stage:Early/Lower Montezuman
Key time interval:Montezuman - Atdabanian
Age range of interval:521.00000 - 514.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Fallotaspis Formation:Puerto Blanco Member:Unit 3
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 117.5m thick. The formation changes facies markedly from one locality to another in the Caborca Region.
Lithology and environment
Primary lithology:gray,yellow lithified "limestone"
Secondary lithology:gray,yellow lithified siltstone
Lithology description: Archaeocyathid-bearing yellow-gray to light-gray indistinctly thin bedded limestone at base and at top of unit. Middle part of unit is yellowish-gray and greenish-gray silststone, yellowish-gray very fine to fine grained quartzite, and minor sandy limestone and siltstone.
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:10681
Authorizer:M. Patzkowsky Enterer:P. Borkow
Modifier:A. Krug Research group:marine invertebrate
Created:2001-06-11 10:28:08 Last modified:2002-05-08 09:35:51
Access level:the public Released:2001-06-11 10:28:08
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]