Toro Toro Formation
Toro Toro Formation
The Toro Toro Formation is a Late Campanian rock unit in central Bolivia, dating roughly 80 to 71 million years ago. It is part of the Puca Group in the Potosí Basin, near Torotoro National Park in Cochabamba Department.
What it’s like
- Rocks: yellowish, porous ferruginous sandstones and mudstones with layers of gypsum.
- Environment of deposition: a beach setting.
What fossils it holds
- It preserves dinosaur footprints (ichnofossils), including Ligabueichnium bolivianum, Dromaeopodus species, and indeterminate tracks from ornithopods, theropods, and titanosaurs.
- It is Bolivia’s oldest known dinosaur track site.
Age and setting
- Time: Late Campanian.
- Depositional context: a post-rift stage with alluvial to deltaic conditions.
Relation to other formations
- Local equivalent: Chaunaca Formation.
Famous track sites
- The most famous Bolivian dinosaur tracks are at Cal Orcko, which are in the El Molino Formation, not Toro Toro.
This page was last edited on 3 February 2026, at 12:47 (CET).