Pircancha Fm., Tarija and Chilcayo, Bolivia (Ordovician of Bolivia)

Where: Bolivia (21.0° S, 65.0° W: paleocoordinates 45.3° S, 129.1° W)

• local area-level geographic resolution

When: Pircancha Formation, Arenig (478.6 - 466.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified, green shale and sandstone

• olive-green lutites and limonites and occasional banks of stratified quartzitic sandstone

Collection methods: JA: marked by Novack-Gottshall without explanation as omitting some genera, some macrofossils, some microfossils, and species names, but apparently complete

Primary reference: M. Toro and S. Fernandez. 1979. Los fosiles de la formacion Pircancha aflorante en Chilcayo, Provincio Mendez - Depto. Tarija. Revista de la Academia Nacional de Ciencas de Bolivia 163-169 [A. Miller/P. Novack-Gottshall]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 9103: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 22.09.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Rhynchonellata
 Orthida - Plaesiomyidae
Dinorthis sp.
Dinorthis sp. Hall and Clarke 1892
Artiopoda
 Agnostida - Metagnostidae
Geragnostus sp.
Geragnostus sp. Howell 1935
Trilobita
 Phacopida - Calymenidae
"Synhomalonotus sp." = Neseuretus
"Synhomalonotus sp." = Neseuretus Hicks 1873 trilobite
 Asaphida - Asaphidae
"Mekynophrys sp." = Basilicus, Hoekaspis sp.
"Mekynophrys sp." = Basilicus Salter 1849 trilobite
Hoekaspis sp. Kobayashi 1937 trilobite
 Trinucleida - Trinucleidae
Famatinolithus sp.
Famatinolithus sp. Harrington and Leanza 1957 trilobite
Pterobranchia
 Graptoloidea - Phyllograptidae
Phyllograptus sp.
Phyllograptus sp. Hall 1858 graptolite
 Graptoloidea - Dichograptidae
Didymograptus sp.
Didymograptus sp. McCoy 1851 graptolite