Strange dinosaur footprints discovery in Bolivia

This 18 February 2019 video says about itself:

Paleontologists Just Found These Strange Vertical Footprints, And This Is What They Think Made Them

In the 1980s, the highlands of Bolivia, while a group of workers were working down, they saw some footsteps printed in vertical cliff near their working zone, they found it strange because it was vertical and the patterns were in clear sequence.