Near Patagual: Carnian, Chile

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gymnospermopsida - Corystospermales - Corystospermaceae
Dicroidium sp. Gothan 1912
Cycadopsida - Cycadales - Nilssoniaceae
Coniferales - Podocarpaceae
Rissikia media (Tenison-Woods 1883)
see common names

Geography
Country:Chile
Coordinates: 37.0° South, 73.0° West (view map)
Paleocoordinates:43.3° South, 31.7° West (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period: Triassic Epoch: Late Triassic
Stage: Carnian 10 m.y. bin: Triassic 3
Key time interval: Carnian
Age range of interval: 237 - 227.3 m.y. ago
Stratigraphy
Formation:Santa Juana
Stratigraphic resolution:group of beds
Stratigraphy comments: "Facies 3" (Nielsen 2005)
Lithology and environment
Primary lithology: sandstone
Secondary lithology: siltstone
Lithology description: "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)
Environment:"floodplain"
Geology comments: "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)
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Also known as:Biobio River
Database number:201290
Authorizer:A. Dunhill Enterer:B. Allen
Created:2019-05-04 13:49:15 Last modified:2025-02-22 15:12:02
Access level:the public Released:2019-05-04 13:49:15
Creative Commons license:CC0
Reference information

Primary reference:
68925. 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]