Rayoso Formation

The Rayoso Formation is a geological formation in the Neuquén Province of Argentina whose strata date back to the Aptian-Albian stages of the Early Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.^[1]

Rayoso Formation
Stratigraphic range: Aptian-Albian, ~120–113 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Huitrín-Rayoso Group
Sub-units	Pichi Neuquén Member
Underlies	Lohan Cura and Carrín Cura Formations
Overlies	La Amarga and Huitrín Formations
Thickness	up to 604 m (1,982 ft)
Lithology
Primary	Sandstone
Location
Coordinates	38.4°S 69.9°W / -38.4; -69.9
Approximate paleocoordinates	40.1°S 37.5°W / -40.1; -37.5
Region	Neuquén Province
Country	Argentina
Extent	Neuquén Basin
Rayoso Formation (Argentina)

Description

The formation has a maximum thickness of 604 metres (1,982 ft) and has one member, the Pichi Neuquén Member. The unit comprises sandstones deposited in a lacustrine environment.^[2]

Fossil content

Indeterminate ceratosaurian remains located in Neuquén Province, Argentina.^[1]

Dinosaurs of the Rayoso Formation
Genus	Species	Presence	Notes	Images
Ceratosauria indet.	Indeterminate	Neuquén Province
Lavocatisaurus	L. agrioensis	Neuquén Province	Specimens representing several individuals at one site, including two juveniles and an adult
Rayososaurus	R. agrioensis	Neuquén Province	Two partial scapulae, most of the left femur, and the proximal half of the left fibula

See also

• List of dinosaur-bearing rock formations