Rodeo Colorado, 270 m (Ordovician of Argentina)

Where: Salta, Argentina (22.7° S, 65.2° W: paleocoordinates 45.6° S, 128.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Bienvillia tetragonalis trilobite zone, Santa Rosita Formation, Tremadocian (485.4 - 477.7 Ma)

• within Paltodus deltiger conodont zone

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, gray, green, silty mudstone

• Facies 1 mostly records continuous background sedimentation. The shale and mudstone of this facies accumulated under low-energy suspension conditions below storm wave base. The abundance of trilobites and other organisms in Facies 1 indicates a suitable environment for the development of benthic life at the sediment-water interface. However, the dark color of some unbioturbated beds may reflect low-oxygen conditions during their deposition.
• Dark and greenish gray, massive to thinly laminated shale, mudstone and silty mudstone [Facies 1]

Size classes: macrofossils, mesofossils

Primary reference: M. F. Tortello and S. B. Esteban. 2016. Early Ordovician trilobites from the Iruya area (Cordillera Oriental, northwestern Argentina) and their stratigraphic significance. Journal of Paleontology 90(5):923-958 [M. Hopkins/M. Hopkins]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 208308: authorized by Melanie Hopkins, entered by Melanie Hopkins on 27.03.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Asaphida - Asaphidae
Asaphellus stenorhachis
Asaphellus stenorhachis Harrington 1938 trilobite
 Olenida - Olenidae
Leptoplastides sp.
Leptoplastides sp. Raw 1908 trilobite