Very interesting, thanks for sharing, @giovanni-rios! Some time ago, I read a brief paper on dinosaur footprints from Bolivia but I can’t find it on my disk now. However, the new paper you shared mentions more than just footprints, as the Molino Formation has yielded vertebrate coprolites and teeth. The co-occurrence of dinosaur footprints and coprolites is particularly interesting to me personally, but the coprolites from the picture might have been produced by crocodiles, turtles, or even fish.