Paleontology, sedimentology and paleoenvironment of a new fossiliferous locality of the Jurassic Cañadón Asfalto Formation, Chubut Province, Argentina
A new Late Jurassic assemblage of " conchostracans", ostracods, bivalves and caddisfly cases from the locality " Estancia La Sin Rumbo", Chubut Province (Patagonia, Argentina) is recorded. The fossils occur in the upper part of an outcropping 45 m thick volcaniclastic lacustrine...
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2011
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v31_n1_p54_Gallego http://hdl.handle.net/20.500.12110/paper_08959811_v31_n1_p54_Gallego |
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paper:paper_08959811_v31_n1_p54_Gallego2023-06-08T15:48:33Z Paleontology, sedimentology and paleoenvironment of a new fossiliferous locality of the Jurassic Cañadón Asfalto Formation, Chubut Province, Argentina Argentina Cañadón Asfalto Formation Late Jurassic Paleontology Patagonia Sedimentology bivalve fossil assemblage fossil record insect Jurassic ostracod paleobiogeography paleoclimate paleoecology paleoenvironment paleontology sedimentology Argentina Chubut Bivalvia Conchostraca Invertebrata Ostracoda Trichoptera A new Late Jurassic assemblage of " conchostracans", ostracods, bivalves and caddisfly cases from the locality " Estancia La Sin Rumbo", Chubut Province (Patagonia, Argentina) is recorded. The fossils occur in the upper part of an outcropping 45 m thick volcaniclastic lacustrine sequence of yellowish tuffs and tuffites of the Puesto Almada Member, which is the upper member of the Cañadón Asfalto Formation with U/Pb age of 161 ± 3. Ma. The sequence represents one sedimentary cycle composed of a (lower) hemicycle of expansion and a (higher) hemicycle of contraction of the water body. The invertebrates lived in small freshwater bodies during the periods of expansion of the lake. The occurrence of a great number of small spinicaudatans, associated with mud-cracks, is evidence of dry climatic conditions and suggests several local mortality events. The spinicaudatan record of the fushunograptid-orthestheriid (component of the Eosestheriopsis dianzhongensis fauna) and the presence of Congestheriella rauhuti Gallego and Shen, suggest a Late Jurassic (Oxfordian to Tithonian) age. Caddisfly cases are recorded for the first time in the Cañadón Asfalto Basin. © 2010 Elsevier Ltd. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v31_n1_p54_Gallego http://hdl.handle.net/20.500.12110/paper_08959811_v31_n1_p54_Gallego |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentina Cañadón Asfalto Formation Late Jurassic Paleontology Patagonia Sedimentology bivalve fossil assemblage fossil record insect Jurassic ostracod paleobiogeography paleoclimate paleoecology paleoenvironment paleontology sedimentology Argentina Chubut Bivalvia Conchostraca Invertebrata Ostracoda Trichoptera |
| spellingShingle |
Argentina Cañadón Asfalto Formation Late Jurassic Paleontology Patagonia Sedimentology bivalve fossil assemblage fossil record insect Jurassic ostracod paleobiogeography paleoclimate paleoecology paleoenvironment paleontology sedimentology Argentina Chubut Bivalvia Conchostraca Invertebrata Ostracoda Trichoptera Paleontology, sedimentology and paleoenvironment of a new fossiliferous locality of the Jurassic Cañadón Asfalto Formation, Chubut Province, Argentina |
| topic_facet |
Argentina Cañadón Asfalto Formation Late Jurassic Paleontology Patagonia Sedimentology bivalve fossil assemblage fossil record insect Jurassic ostracod paleobiogeography paleoclimate paleoecology paleoenvironment paleontology sedimentology Argentina Chubut Bivalvia Conchostraca Invertebrata Ostracoda Trichoptera |
| description |
A new Late Jurassic assemblage of " conchostracans", ostracods, bivalves and caddisfly cases from the locality " Estancia La Sin Rumbo", Chubut Province (Patagonia, Argentina) is recorded. The fossils occur in the upper part of an outcropping 45 m thick volcaniclastic lacustrine sequence of yellowish tuffs and tuffites of the Puesto Almada Member, which is the upper member of the Cañadón Asfalto Formation with U/Pb age of 161 ± 3. Ma. The sequence represents one sedimentary cycle composed of a (lower) hemicycle of expansion and a (higher) hemicycle of contraction of the water body. The invertebrates lived in small freshwater bodies during the periods of expansion of the lake. The occurrence of a great number of small spinicaudatans, associated with mud-cracks, is evidence of dry climatic conditions and suggests several local mortality events. The spinicaudatan record of the fushunograptid-orthestheriid (component of the Eosestheriopsis dianzhongensis fauna) and the presence of Congestheriella rauhuti Gallego and Shen, suggest a Late Jurassic (Oxfordian to Tithonian) age. Caddisfly cases are recorded for the first time in the Cañadón Asfalto Basin. © 2010 Elsevier Ltd. |
| title |
Paleontology, sedimentology and paleoenvironment of a new fossiliferous locality of the Jurassic Cañadón Asfalto Formation, Chubut Province, Argentina |
| title_short |
Paleontology, sedimentology and paleoenvironment of a new fossiliferous locality of the Jurassic Cañadón Asfalto Formation, Chubut Province, Argentina |
| title_full |
Paleontology, sedimentology and paleoenvironment of a new fossiliferous locality of the Jurassic Cañadón Asfalto Formation, Chubut Province, Argentina |
| title_fullStr |
Paleontology, sedimentology and paleoenvironment of a new fossiliferous locality of the Jurassic Cañadón Asfalto Formation, Chubut Province, Argentina |
| title_full_unstemmed |
Paleontology, sedimentology and paleoenvironment of a new fossiliferous locality of the Jurassic Cañadón Asfalto Formation, Chubut Province, Argentina |
| title_sort |
paleontology, sedimentology and paleoenvironment of a new fossiliferous locality of the jurassic cañadón asfalto formation, chubut province, argentina |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v31_n1_p54_Gallego http://hdl.handle.net/20.500.12110/paper_08959811_v31_n1_p54_Gallego |
| _version_ |
1768542225349738496 |