El Tranquilo Group

El Tranquilo Group
Stratigraphic range: Late Triassic ~228–200 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geologic group
Sub-units	Laguna Colorada Formation
Lithology
Primary	Sandstone
Location
Coordinates	48°06′S 69°30′W / 48.1°S 69.5°W / -48.1; -69.5
Approximate paleocoordinates	57°00′S 26°12′W / 57.0°S 26.2°W / -57.0; -26.2
Region	Santa Cruz Province
Country	Argentina
Extent	Austral Basin
El Tranquilo Group (Argentina)

The El Tranquilo Group is a geologic group dating to roughly between 228 and 200 million years ago and covering part of the Late Triassic. The El Tranquilo Group is found in the Austral Basin of Santa Cruz Province of Argentina. Fossil flora and purported fossils of the prosauropod dinosaur Mussaurus have been recovered from the El Tranquilo Sandstone.^[1] In older publications, the group was defined as a formation.^[2] The group contains the Laguna Colorada Formation.