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Santa Juana Formation
Geologic formation in Chile From Wikipedia, the free encyclopedia
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Santa Juana Formation a Late Triassic (Carnian stage) sedimentary rock formation near Santa Juana in the lower course of the Biobío River in south-central Chile.[1] Lithologies range from conglomerate sandstone, arkosic sandstone, siltstone and mudstone.[2]
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Description
The sediments that consolidate into the rocks of the formation deposited in alluvial, fluvial, lacustrine and playa lake environment. Overall, the formation is rich in plant fossils.[2]
The formation was deposited over the rocks of the Coastal Batholith of central Chile in a sedimentary basin that formed along the Gastre Fault. It has been posited that the basin developed as a rift during the early break-up of Gondwana in the Triassic.[2]
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Fossil content
The following fossils have been reported from the formation:[1]
Flora
- Asterotheca fuchsii[2]
- A. rigbyana[3]
- Baiera africana[3]
- B. furcata[3]
- Cladophlebis mendozaensis[3]
- Dicroidium coriaceum[3]
- D. crassinervis[2]
- D. elongatum[2]
- D. odontopteroides[2][3]
- Dictyophyllum fuenzalidai[2]
- D. tenuifolium[2][3]
- Gleichenites quilacoyensis[3]
- Gontriglossa reinerae[2]
- Heidiphyllum elongatum[2][3]
- Kurtziana cacheutensis[2]
- Linguifolium lilleanum[3]
- L. steinmannii[2]
- Pterophyllum santajuanensis[2][3]
- Rissikia media[2]
- Saportaea dichotoma[2]
- Sphenobaiera africana[2]
- Sphenopteris cf. polymorpha[3]
- Taeniopteris sp.[3]
- Taeniopteris vittata[3]
- Telemachus elongatus[2]
- Thaumatopteris rothii[2]
- Todites chilensis[3]
- cf. Pseudoctenis fissa[2]
- Cladophlebis sp.[2][3]
- Dicroidium sp.[2]
- Gleichenites sp.[2]
- ?Antevsia sp.[2]
Insects
Branchiopoda
- Polygrapta troncosoi[4]
- Menucoestheria terneraensis[4]
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See also
- Chañares Formation, fossiliferous formation of the Ischigualasto-Villa Unión Basin, Argentina
- Candelária Formation, contemporaneous fossiliferous formation of the Paraná Basin, Brazil
- Molteno Formation, contemporaneous fossiliferous formation of Lesotho and South Africa
- Pebbly Arkose Formation, contemporaneous fossiliferous formation of Botswana, Zambia and Zimbabwe
- Denmark Hill Insect Bed, contemporaneous fossiliferous unit of Queensland, Australia
- Madygen Formation, contemporaneous Lagerstätte of Kyrgyzstan
References
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