| 词条 | Tarjados Formation |
| 释义 |
| name = Tarjados Formation | image = Yacimiento Talampaya W2013.jpg | caption = Sandstones in Talampaya National Park | type = Geological formation | period = Ladinian | age = Early-Mid Triassic ~{{fossil range|252|236}} | prilithology = Sandstone | otherlithology = Conglomerate | namedfor = Sierra de Los Tarjados | namedby = Romer & Jensen | year_ts = 1966 | region = La Rioja Province | country = {{ARG}} | coordinates = {{coord|29.8|S|67.8|W|display=inline,title}} | paleocoordinates = {{coord|48.0|S|38.9|W|display=inline}} | unitof = Paganzo Group | subunits = | underlies = Chañares Formation | overlies = Talampaya Formation | thickness = Up to {{convert|250|m|ft|abbr=on}} | extent = Ischigualasto-Villa Unión Basin | area = | map = {{Location map+ | Argentina | relief = 1 | width = 250 | float = center | places = | lat_deg = -29.8 | lon_deg = -67.8 | mark = Pink ff0080 pog.svg | marksize = 12 }} | map_caption = }} The Tarjados Formation is an Early to Middle Triassic geologic formation in the Ischigualasto-Villa Unión Basin of La Rioja Province in northwestern Argentina. The red to whitish sandstones and conglomerates of the formation were deposited in an arid fluvial environment. The formation overlies the Talampaya Formation and is overlain by the Chañares Formation of the Agua de la Peña Group. The formation has provided fossils of an archosaur and a kannemeyeriid dicynodont, both not yet placed in a dedicated genus. The formation crops out in the Talampaya National Park, which was designated a UNESCO World Heritage Site in 2000.[1] DescriptionThe formation was first defined by Romer and Jensen in 1966,[2] based on a type section exposed in the Sierra de Los Tarjados.[3] The Tarjados Formation, as the underlying Talampaya Formation, belongs to the Paganzo Group.[4] The formation is exposed in the Talampaya National Park of La Rioja Province. The Tarjados Formation is overlain by the Chañares Formation, separated by a regional unconformity.[5] The formation, reaching a maximum thickness of {{convert|250|m|ft}},[6][7] comprises red to greenish grey sandstones,[8] deposited in an eolian and playa-lacustrine to fluvial environment.[9] The sediments were deposited under arid,[10] or semi-arid conditions.[9] The formation has provided fossils of an archosaur and a kannemeyeriid dicynodont, both not yet placed in a dedicated genus.[11][12] See also{{Portal|Geology|Paleontology|Triassic|Prehistory of South America}}
References1. ^Talampaya National Park at Fossilworks.org 2. ^Caselli, 1998, p.22 3. ^Balabusic et al., 2001, p.14 4. ^Tarjados Formation at Fossilworks.org 5. ^Balabusic et al., 2001, p.26 6. ^Aceituno Cieri et al., 2015, p.60 7. ^Monetta et al., 2000, p.648 8. ^Monetta et al., 2000, p.644 9. ^1 Ezcurra et al., 2015, p.476 10. ^Balabusic et al., 2001, p.28 11. ^Ezcurra et al., 2015, p.478 12. ^Ezcurra et al., 2015, p.479 Bibliography
Further reading
18 : Geologic formations of Argentina|Triassic System of South America|Early Triassic South America|Middle Triassic South America|Lower Triassic Series|Middle Triassic Series|Triassic Argentina|Anisian Stage|Ladinian Stage|Olenekian|Sandstone formations|Conglomerate formations|Aeolian deposits|Fluvial deposits|Lacustrine deposits|Fossiliferous stratigraphic units of South America|Paleontology in Argentina|Geology of La Rioja Province, Argentina |
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