Lutitas Cocachacra, Rodriguez collection (Devonian of Peru)

Where: Peru (17.1° S, 71.8° W)

• Paleocoordinates: 68.2° S, 86.8° W (Wright 2013)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Lutitas Cocachacra Formation, Early/Lower Devonian (419.2 - 393.3 Ma)

• Authors tentatively suggest correlation with Emsian Floresta Fmn. in Colombia.

• member-level stratigraphic resolution

Environment/lithology: marine; fine-grained, micaceous sandstone and brown, cherty/siliceous siltstone

• "Devonian...consists of alower, conglomeratic unit...overlain by an upper unit of quartzite and finer-grained rocks, the "Lutitas Cocachacra"...the conglomeratic unit is polymictic...Above the conglomerate are quartzites and fine-grained, indurated and slabby beds of the Cocachacra lutites [about 30-40 m thick] [which] might represent reworked, silicified volcanic material [containing quartz, biotite, and muscovite]...The fossils occur in dark brown, flinty siltstone..."

Primary reference: A. J. Boucot, P. E. Isaacson, and G. Laubacher. 1980. An Early Devonian, Eastern Americas Realm faunule from the coast of southern Peru. Journal of Paleontology 54(2):359-365 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 36140: authorized by Michael Foote, entered by Michael Foote on 14.01.2004

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Bivalvia
  -
"? Pelecypoda indet." = Bivalvia
"? Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
Rhynchonellata
 Rhynchonellida - Trigonirhynchiidae
Cupularostrum cf. macrocosta
 Orthida -
? Orthida indet.
? Orthida indet. Schuchert and Cooper 1932
"isorthid?"
 Spiriferida - Acrospiriferidae
Acrospirifer cf. atlanticus