| 词条 | Arcabuco Formation |
| 释义 |
| name = Arcabuco Formation | period = Berriasian | age = Tithonian-Berriasian ~{{fossil range|145|142}} | image = Sáchica rock shelter - Cross-bedded sandstone - Arcabuco Formation.jpg | imagesize = | caption = Arcabuco Formation at the Sáchica rock shelter | type = Geological formation | prilithology = Sandstone | otherlithology = Shale | unitof = | subunits = | underlies = Rosablanca Fm., Cumbre Fm. | overlies = Girón Formation | thickness = {{convert|500|-|800|m|ft|abbr=on}} | area = | map = Blakey 150Ma - COL.jpg | map_caption = Paleogeography of Northern South America 150 Ma, {{small|by Ron Blakey}} | location | coordinates = {{coord|5|38|11|N|73|30|41|W|display=inline,title}} | region = Altiplano Cundiboyacense Eastern Ranges, Andes | country = {{COL}} | extent = | namedfor = Arcabuco | namedby = Scheibe | year_ts = 1938, 1985 | location_ts = Arcabuco (original) Villa de Leyva (redefined) | coordinates_ts = {{coord|5|38|11|N|73|30|41|W|display=inline}} | paleocoordinates_ts = | region_ts = Boyacá | country_ts = {{COL}} | thickness_ts = }} The Arcabuco Formation ({{lang-es|Formación Arcabuco}}, Jar, JKa) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists of thick beds of light-coloured quartzitic sandstones and conglomerates with occasional shales and dates to the Late Jurassic and Early Cretaceous periods; Tithonian to Berriasian epochs. Dinosaur footprints have been found in the Arcabuco Formation near the Iguaque anticlinal outside Chíquiza, Boyacá. EtymologyThe formation was first defined by Scheibe in 1938 and named after Arcabuco, Boyacá.[1] The type section of the Arcabuco Formation was redefined in 1985 by Galvis and Rubiano around Villa de Leyva.[1] DescriptionLithologiesThe Arcabuco Formation is characterised by a sequence of light- to pink-coloured fine quartzitic sandstones and conglomerates with red shales up to {{convert|50|m|ft}} in thickness intercalated.[2][3] In the Arcabuco Formation, in the Iguaque Anticlinal, dinosaur tracks have been found.[5] The overhanging rock shelter of Sáchica in Sáchica, Boyacá, consists of the sandstones of the Arcabuco Formation. Stratigraphy and depositional environmentThe {{convert|500|to|800|m|ft}} thick Arcabuco Formation unconformably overlies the Girón Formation and is overlain by the Rosablanca and Cumbre Formations.[4] The age has been estimated to be Late Jurassic to Early Cretaceous. Stratigraphically, the formation is time equivalent with the Guavio and La Naveta Formations of the eastern and southern Altiplano respectively.[2][5] The Arcabuco Formation has been deposited in a rift basin setting.[6] Outcrops{{Location map | Altiplano Cundiboyacense| width = 250 | lat_deg = 5.636567 | lon_deg = -73.511399 | label = | float = left | position = right | mark = Green-blue dot.svg | marksize = 12 | caption = Redefined type locality of the Arcabuco Formation on the Altiplano Cundiboyacense }} The Arcabuco Formation is found apart from its original type locality near Arcabuco, in the anticlinal of Lake Iguaque between Villa de Leyva, Sáchica and Chíquiza, where the formation has been redefined in the Arcabuco Anticlinal.[7][8] {{clearleft}}Regional correlations{{Cretaceous stratigraphy of the central Colombian Eastern Ranges}}See also{{portal|Colombia|Geology|Prehistory of South America|Jurassic|Cretaceous}}{{icon|List}} List of stratigraphic units with dinosaur tracks {{icon|FAC}} Geology of the Eastern Hills {{icon|B}} Geology of the Ocetá Páramo {{icon|C}} Geology of the Altiplano Cundiboyacense{{clearboth}} References1. ^Galvis & Valencia, 2009, p.15 2. ^1 2 Galvis & Valencia, 2009, p.17 3. ^Rodríguez & Solano, 2000, p.28 4. ^Rodríguez & Solano, 2000, p.29 5. ^Villamil, 2012, p.168 6. ^Villamil, 2012, p.163 7. ^1 Moreno Sánchez et al., 2011 8. ^Plancha 191, 1998 Bibliography
Maps
External links
13 : Geologic formations of Colombia|Paleontology in Colombia|Jurassic Colombia|Cretaceous Colombia|Jurassic System of South America|Lower Cretaceous Series of South America|Tithonian Stage|Berriasian Stage|Sandstone formations|Shallow marine deposits|Altiplano Cundiboyacense|Geography of Boyacá Department|Muysccubun |
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