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Socotá Formation
The Socotá Formation (, Kis) is a formation (geology), geological formation of the Altiplano Cundiboyacense, Cordillera Oriental (Colombia), 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 Cretaceous, Early Cretaceous period; Aptian, Late Aptian epoch and in Quipile has a measured thickness of with large regional variations. The formation hosts ammonite fossils. Etymology The formation was defined as a thicker sequence and named in 1969 by Cáceres and Fernando Etayo, Etayo after Socotá, a vereda of Apulo, Cundinamarca Department, Cundinamarca. The name Socotá in Chibcha language, Muysccubun, the language of the native Muisca, means either "Land of the Sun and farmfields" or "Good harvest". Description Lithologies The Socotá Formation has a maximum thickness of , and is characterised by a lower sequence of calcareous sandstones and an upper part of shales. Fossils of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aptian
The Aptian is an age (geology), age in the geologic timescale or a stage (stratigraphy), stage in the stratigraphic column. It is a subdivision of the Early Cretaceous, Early or Lower Cretaceous epoch (geology), Epoch or series (stratigraphy), Series and encompasses the time from 121.4 ± 1.0 annum, Ma to 113.0 ± 1.0 Ma (million years ago), approximately. The Aptian succeeds the Barremian and precedes the Albian, all part of the Lower/Early Cretaceous. The Aptian partly overlaps the upper part of the Western Europe, Western European Urgonian Stage. The Selli Event, also known as OAE1a, was one of two oceanic anoxic events in the Cretaceous Period, which occurred around 120 annum, Ma and lasted approximately 1 to 1.3 million years, being marked by enhanced silicate weathering, as well as ocean acidification. The Aptian extinction was a minor extinction event hypothesized to have occurred around 116 to 117 Ma. Stratigraphic definitions The Aptian was named after the small city o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
