The Noreán Formation is a geological formation of the Eastern Ranges of the Colombian Andes, the Serranía de San Lucas and as basement underlying the southernmost Lower and northern Middle Magdalena Valleys. The formation consists of volcanic and pyroclastic lavas that range from andesites to rhyolites. Vitric, lithic and crystal tuffs and andesitic dikes and hypabyssal bodies are also present in the formation.
Outcrop of the Effusive Rhyolitic Unit (Jner) south of Pailitas, Cesar
Paleogeography of Northern South America 200 Ma, by Ron Blakey
Image: Blakey Pleist COL
Image: Blakey 020Ma COL
The La Quinta Formation is a Jurassic geologic formation which crops out in the Cordillera de Mérida and Serranía del Perijá of western Venezuela and northeastern Colombia. The formation is also present in the subsurface of the Cesar-Ranchería and Maracaibo Basins. At its type locality near La Grita, Táchira, it consists of a basal dacitic tuff followed by interlayered sandstones, tuffs, siltstones and rare limestones. Dinosaur remains including Laquintasaura, Tachiraptor, and Perijasaurus are among the fossils that have been recovered from the formation.
The La Quinta Formation near its type section in Táchira, Venezuela
Image: Blakey Pleist COL
Image: Blakey 020Ma COL
Image: Blakey 035Ma COL
