Lutitas Cocachacra, Isaacson collection: Early/Lower Devonian, Peru

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata - Spiriferida - Acrospiriferidae
Acrospirifer cf. atlanticus
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Cupularostrum cf. macrocosta
Bivalvia
? Pelecypoda indet. Goldfuss 1820
synonym of Bivalvia
see common names

Geography
Country:Peru
Coordinates: 17.1° South, 71.8° West (view map)
Paleocoordinates:58.7° South, 94.0° West
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period:Devonian Epoch:Early/Lower Devonian
10 m.y. bin:Devonian 1-2
Key time interval:Early/Lower Devonian
Age range of interval:419.20000 - 393.30000 m.y. ago
Stratigraphy
Formation:Lutitas Cocachacra
Stratigraphic resolution:member
Stratigraphy comments: Authors tentatively suggest correlation with Emsian Floresta Fmn. in Colombia.
Lithology and environment
Primary lithology:fine,micaceous sandstone
Secondary lithology:brown cherty/siliceous siltstone
Includes fossils?Y
Lithology description: "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..."
Environment:marine indet.
Taphonomy
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:36142
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2004-01-14 10:08:55 Last modified:2006-09-13 14:01:03
Access level:the public Released:2004-01-14 10:08:55
Creative Commons license:CC BY
Reference information

Primary reference:
9699. 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]