Isolated fossil bee cells and other trace fossils are documented from the Santa Cruz Fm.
The bee cells are ascribed to C. rosellii and to a new ichnospecie, C. argentina.
First report of Feoichnus challa and Fictovichnus gobiensis from the Santa Cruz Fm
The ichnoassemblage recorded are considered to be part of a Celliforma ichnofacies.
Our data support the hypothesis of a climatic change for these interval in the unit.