Cerro Rajon, type 1 buildup, Puerto Blanco Formation, unit 3, Caborca (Cambrian of Mexico)

Also known as Reef 1790

Where: Mexico (30.4° N, 112.0° W: paleocoordinates 4.3° S, 102.8° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: unit 3 Member (Puerto Blanco Formation), Botomian (516.0 - 512.9 Ma)

• interval CR-1 in the lower part of unit 3

• bed-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified reef rocks

• wave-resistent bioherms in a tidally dominated, shelf-margin setting seaward of a carbonate barrier
• archaeocyathan framework with encrusting renalcids and abundant fibrous cements; internal sediment consists of pink lime mud with sponge spicules

Size classes: macrofossils, mesofossils

Collection methods: peel or thin section,

• skeletal debris along the external parts of the buildup consists of fragments of trilobites, hyoliths, archaeocyaths, brachiopods, Chancelloria spicules and rare echinoderm plates

Primary reference: F. Debrenne, A. Gandin, and S. M. Rowland. 1989. Lower Cambrian bioconstructions in Northwestern Mexico (Sonora). Depositional setting, paleoecology and systematics of Archaeocyaths. GĂ©obios 22(2):137-195 [W. Kiessling/U. Merkel/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 62864: authorized by Wolfgang Kiessling, entered by Uta Merkel on 31.07.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Archaeocyatha
 Ajacicyathida - Sajanocyathidae
Palmericyathus americanus archaeocyath sponge
 Ajacicyathida - Ajacicyathidae
? Rotundocyathus pusillus archaeocyath sponge
 Ajacicyathida - Ethmophyllidae
Cordilleracyathus meridianus archaeocyath sponge
 Archaeocyathida - Loculicyathidae
Paranacyathus polycladus n. sp. archaeocyath sponge
 Archaeocyathida - Metacyathidae
Metaldetes cf. fischeri archaeocyath sponge
 Archaeocyathida - Dictyocyathidae
Dictyocyathus sp. archaeocyath sponge
sp. 1
Graphoscyphia ramosa n. sp. archaeocyath sponge
 Archaeocyathida - Claruscoscinidae
? Claruscoscinus sp. Handfield 1971 archaeocyath sponge
 Archaeocyathida - Archaeopharetridae
Protopharetra sp. Bornemann 1884 archaeocyath sponge
 Archaeocyathida - Archaeocyathidae
"Batenevia spinosa n. sp." = Archaeocyathus
"Batenevia spinosa n. sp." = Archaeocyathus archaeocyath sponge
Renalcis
  - Chabakoviacea
Renalcis sp. Vologdin 1932