Portezuelo Tontal Fm., Sierra del Tontal, Argentina (Ordovician of Argentina)

Where: Argentina (31.0° S, 69.0° W: paleocoordinates 33.8° S, 133.9° W)

• local area-level geographic resolution

When: Portezuelo Tontal Formation, Late/Upper Llandeilo (461.1 - 458.4 Ma)

• formation-level stratigraphic resolution

Environment/lithology: submarine fan; lithified sandstone

• Turbidites
• sandy turbidites

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: A. Cuerda, R. Varela, C. Cingolani and O. Schauer. 1988. Nuevas localidades con graptolitos en la Formacion Portezuelo Tontal (Ordovicico), Sector Septentrional de la Sierra del Tontal, Precordillera de San Juan, Argentina. Ameghiniana 25(2):175-183 [A. Miller/P. Novack-Gottshall/M. Uhen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 8892: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 02.09.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Pterobranchia
 Graptoloidea - Retiolitidae
Glyptograptus sp.
 Graptoloidea - Diplograptidae
Diplograptus sp.
Diplograptus sp. graptolite
 Graptoloidea - Dicranograptidae
Dicranograptus sp., Dicellograptus sp.
Dicranograptus sp. Hall 1865 graptolite
Dicellograptus sp. Hopkinson 1871 graptolite
 Graptoloidea - Dichograptidae
Didymograptus sp.
Didymograptus sp. McCoy 1851 graptolite