Sierra Barrosa Formation

Sierra Barrosa Formation
Stratigraphic range: Mid-late Coniacian
~88–86 Ma
TypeGeological formation
Unit ofNeuquén Group
 Río Neuquén Subgroup
UnderliesPlottier Formation
OverliesLos Bastos Formation
ThicknessUp to 62 m (203 ft)
Lithology
PrimaryMudstone
OtherSandstone
Location
Coordinates38°52′10″S 68°51′20″W / 38.86944°S 68.85556°W / -38.86944; -68.85556
Approximate paleocoordinates42°48′S 48°24′W / 42.8°S 48.4°W / -42.8; -48.4
RegionMendoza & Neuquén Provinces
Country Argentina
ExtentNeuquén Basin
Type section
Named forSierra Barrosa
Named by2010
Year definedGarrido
Sierra Barrosa Formation is located in Argentina
Sierra Barrosa Formation
Sierra Barrosa Formation (Argentina)

The Sierra Barrosa Formation is a geologic formation of the Neuquén Basin in the northern Patagonian provinces of Mendoza and Neuquén. The formation dates to the Late Cretaceous, middle to late Coniacian, and belongs to the Río Neuquén Subgroup of the Neuquén Group. The formation overlies the Los Bastos Formation and is overlain by the Plottier Formation. As the underlying Los Bastos Formation, the Sierra Barrosa Formation comprises mudstones and sandstones deposited in a fluvial environment.