The Los Blanquitos Formation is a geological formation in Salta Province, Argentina whose strata date back to the late Campanian to early Maastrichtian age of the Late Cretaceous Period.

[2] The formation consists of friable, micaceous, grayish-red sandstones with quartz pebbles containing small carbonate veins.

In the base of this layer the remains of a titanosaurid dinosaur were discovered.

Above the layer with bones appears a lens of thick, greenish-gray, calcareous, very hard sandstone with pebbles and gravel.

The bones were covered by a "halo" of the same rock but of greenish or grayish color, especially visible because the normal sediment is red.