Near Patagual (Triassic of Chile)

Also known as Biobio River

Where: Chile (37.0° S, 73.0° W: paleocoordinates 53.7° S, 40.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Santa Juana Formation, Carnian (237.0 - 228.0 Ma)

• "Facies 3" (Nielsen 2005)

• group of beds-level stratigraphic resolution

Environment/lithology: "floodplain"; sandstone and siltstone

• "The facies assemblage and upward-fining cycles indicate distal rivers and alluvial plain deposits. The repeated succession of structures like ripple marks, root horizons, and layers with plant debris suggests deposition in floodplain lakes that were later colonized by rooting plants." (Nielsen 2005)
• "Facies 3 consists mainly of yellowish to red, weathering, interbedded sandstones and siltstones. Red-brown staining is interpreted as due to oxidation of pyrite contained in

•carbonaceous plant debris (Bell and Suarez, 1995). Some siltstone layers are cross-laminated, whereas some sandstone bedding surfaces contain asymmetrical current ripple marks. Root traces are also common." (Nielsen 2005)

Size class: macrofossils

Primary reference: S. N. Nielsen. 2005. The Triassic Santa Juana Formation at the lower Biobío River, south central Chile. Journal of South American Earth Sciences 19:547-562 [A. Dunhill/B. Allen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 201290: authorized by Alex Dunhill, entered by Bethany Allen on 04.05.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
 Coniferales - Podocarpaceae
Rissikia media
Rissikia media Tenison-Woods 1883 podocarp
Gymnospermopsida
 Corystospermales - Corystospermaceae
Dicroidium sp.
Dicroidium sp. Gothan 1912
Cycadopsida
 Cycadales - Nilssoniaceae
cf. Pseudoctenis fissa
cf. Pseudoctenis fissa Du Toit 1927 cycads