| 词条 | Socotá Formation |
| 释义 |
| name = Socotá Formation | period = Aptian | age = Late Aptian ~{{fossil range|115|112}} | image = | imagesize = | caption = | type = Geological formation | prilithology = Sandstone | otherlithology = Shale | unitof = Villeta Group | subunits = | underlies = El Peñón Fm., Hiló Fm., Capotes Fm. | overlies = Trincheras Formation | thickness = more than {{convert|255|m|ft|abbr=on}} | area = | map = Blakey 120Ma - COL.jpg | map_caption = Paleogeography of Northern South America 120 Ma, {{small|by Ron Blakey}} | location | coordinates = {{coord|4|31|19|N|74|33|06|W|display=inline,title}} | region = Altiplano Cundiboyacense Eastern Ranges, Andes | country = {{COL}} | extent = | namedfor = Socotá, Apulo | namedby = Cáceres & Etayo | year_ts = 1969 | location_ts = Apulo | coordinates_ts = {{coord|4|31|19|N|74|33|06|W|display=inline}} | paleocoordinates_ts = | region_ts = Cundinamarca | country_ts = {{COL}} | thickness_ts = }} The Socotá Formation ({{lang-es|Formación Socotá}}, Kis) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consisting of a lower unit of calcareous sandstones and an upper sequence of shales dates to the Early Cretaceous period; Late Aptian epoch and in Quipile has a measured thickness of {{convert|255|m|ft}} with large regional variations. The formation hosts ammonite fossils. EtymologyThe formation was defined as a thicker sequence and named in 1969 by Cáceres and Etayo after Socotá, a vereda of Apulo, Cundinamarca.[1] The name Socotá in Muysccubun, the language of the native Muisca, means either "Land of the Sun and farmfields" or "Good harvest".[1] DescriptionLithologiesThe Socotá Formation has a maximum thickness of {{convert|600|m|ft}}, and is characterised by a lower sequence of calcareous sandstones and an upper part of shales. Fossils of the ammonites Stoyanowiceras treffryanus, Dufrenoyia sanctorum, Parahoplites (?) hubachi, and Acanthoplites (?) leptoceratiforme have been found in the Socotá Formation.[2] Stratigraphy and depositional environmentThe Socotá Formation overlies the Trincheras Formation and is partly overlain by and partly time equivalent with the El Peñón Formation.[3] In other areas, the formation underlies the Capotes and Hiló Formations.[5][4] The age has been estimated to be Late Aptian. Stratigraphically, the formation is time equivalent with the Tablazo, Caballos and Une Formations.[5][6] The formation has been deposited in a marine platform environment.[2] in terms of sequence stratigraphy, the Socotá Formation is part of a transgressive cycle.[7] Outcrops{{Location map | Altiplano Cundiboyacense| width = 250 | lat_deg = 4.522024 | lon_deg = -74.551836 | label = | float = left | position = right | mark = Green pog.svg | marksize = 12 | caption = Type locality of the Socotá Formation to the southwest of the Altiplano Cundiboyacense }} The Socotá Formation is apart from its type locality, found from Viotá in the south to Útica in the north.[2] The formation crops out on both sides of the Bogotá River in Anapoima and Apulo.[8][9][10] {{clearleft}}Regional correlations{{Cretaceous stratigraphy of the central Colombian Eastern Ranges}}See also{{portal|Colombia|Geology|Prehistory of South America|Cretaceous}}{{icon|FAC}} Geology of the Eastern Hills {{icon|B}} Geology of the Ocetá Páramo {{icon|C}} Geology of the Altiplano Cundiboyacense{{clearboth}} References1. ^{{es}} Etymology Socotá 2. ^1 2 3 Acosta & Ulloa, 2002, p.41 3. ^Acosta & Ulloa, 2002, p.42 4. ^Acosta & Ulloa, 2002, p.43 5. ^1 Villamil, 2012, p.168 6. ^Acosta & Ulloa, 2001, p.16 7. ^Villamil, 2012, p.205 8. ^García Rivas, 2016 9. ^Plancha 227, 1998 10. ^Plancha 246, 1998 Bibliography
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External links
10 : Geologic formations of Colombia|Cretaceous Colombia|Lower Cretaceous Series of South America|Aptian Stage|Sandstone formations|Shale formations|Open marine deposits|Altiplano Cundiboyacense|Geography of Cundinamarca Department|Muysccubun |
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