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

Also known as Reef 1788

Where: Mexico (30.3° N, 112.0° W: paleocoordinates 1.4° S, 98.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• 2 levels (2 m and 19 m thick) within unit 3

• group of beds-level stratigraphic resolution

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

• wave-resistent biostrome and thick kalyptrate reef in a tidally dominated, shelf-margin setting seaward of a carbonate barrier
• archaeocyathan framework with encrusting renalcids and abundant fibrous cements

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 62866: authorized by Wolfgang Kiessling, entered by Uta Merkel on 31.07.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

 Archaeocyathida - Dictyocyathidae
Dictyocyathus sp. archaeocyath sponge
sp. 1
 Archaeocyathida - Archaeopharetridae
Protopharetra sp. Bornemann 1884 archaeocyath sponge
 Archaeocyathida - Archaeocyathidae
Arrythmocricus macdamensis archaeocyath sponge
"Batenevia spinosa" = Archaeocyathus archaeocyath sponge
Archaeocyathus arborensis Okulitch 1954 archaeocyath sponge
 Archaeocyathida - Metacyathidae
Metaldetes cf. fischeri archaeocyath sponge
 Archaeocyathida - Loculicyathidae
Paranacyathus polycladus archaeocyath sponge
 Ajacicyathida - Ethmophyllidae
Aulocricus arellani archaeocyath sponge
Cordilleracyathus meridianus archaeocyath sponge
 Ajacicyathida - Ajacicyathidae
? Rotundocyathus pusillus archaeocyath sponge
  - Chabakoviacea
Renalcis sp. Vologdin 1932