Los Alamitos Formation

Los Alamitos Formation
Stratigraphic range: Late Campanian-Maastrichtian ~85–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Sub-units	Coli Toro Member
Lithology
Primary	Siltstone
Other	Sandstone
Location
Coordinates	42°06′S 66°18′W / 42.1°S 66.3°W / -42.1; -66.3
Approximate paleocoordinates	45°00′S 52°18′W / 45.0°S 52.3°W / -45.0; -52.3
Region	Río Negro Province
Country	Argentina
Extent	North Patagonian Massif
Los Alamitos Formation (Argentina)

The Los Alamitos Formation is a geological formation of the North Patagonian Massif in Rio Negro Province, northwestern Patagonia, Argentina, whose strata date back to the Late Cretaceous (Late Campanian to Maastrichtian). Dinosaur remains are among the fossils that have been recovered from the formation.^[1]