The Carapacha Basin is considered to be a continental half-graben of Permian age located in southern La Pampa province, central Argentina, between approximately 37° 30' to 38° 40' S and 65° 40' to 66° 20' W. The basin filling is about thick and entirely composed of the Carapacha Formation. The base of the formation cannot be observed and is covered and intruded by Permian-Triassic volcanic rocks of the Choiyoi Group.Melchor & Sarjeant, 2004, p.58
