The Cañadón Calcáreo Formation is an Oxfordian to Kimmeridgian -aged geologic formation , from the Cañadón Asfalto Basin in Chubut Province , Argentina, a rift basin that started forming since the earliest Jurassic. It was formerly thought to date into the Cretaceous , but the age has been revised with Uranium–lead dating as likely being solely Late Jurassic in age.
4-575: It is a subunit of the Sierra de Olte Group , close to the city Cerro Condor in the Chubut Province of northwestern Patagonia , in southern Argentina . The formation is composed primarily of fluvial sandstones alongside shales and volcanic tuffites The formation preserves fishes , crocodylomorphs and some dinosaur taxa, as well as conifers . The Cañadón Calcáreo Formation is composed mainly of fluvial deposits, that are found close to
8-733: The Cañadón Asfalto Formation . While originally thought to be part of the Cañadón Asfalto, there is a lack of calcareous rocks, and the geologic faulting and folding is weaker. The Cañadón Calcáreo Formation is overlain by the Chubut Group , the rocks of which lack synsedimentary deformation. The area of the Cañadón Calcáreo also includes lacustrine and palustrine rocks, including shales , pelites , psammites and coarse clastics . The age of
12-546: The Cañadón Calcáreo Formation was originally presumed to be Late Jurassic , probably Kimmeridgian to Tithonian in age. However, it has also been suggested to span the entire Late Jurassic, beginning in the Oxfordian , although this could also be because of the uncertainty of the youngest age Cañadón Asfalto Formation. A 2009 study of the palynology from a section of the formation revealed an age that
16-537: Was Hauterivian , which suggests that the formation extends from the Late Jurassic into the Early Cretaceous. Cerro Condor Cerro Cóndor is a village and municipality in Chubut Province in southern Argentina . 43°25′16″S 69°09′47″W / 43.42111°S 69.16306°W / -43.42111; -69.16306 This article about a place in Chubut Province , Argentina
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