  We investigate the possibility to find a characteristic TeV scale quantum
black holes decay signature in the data recorded by cosmic rays experiments.
TeV black holes can be produced via the collisions of ultra high energetic
protons (E > $10^18$ eV) with nucleons the from atmosphere. We focus on the
case when the black holes decay into two particles moving in the forward
direction in the Earth reference frame (back-to-back in the center of mass
reference frame) and induce two overlapping showers. When reconstructing both
the energy and the shape of the resultant air shower, there is a significant
difference between showers induced only via standard model interactions and
showers produced via the back-to-back decay of black holes as intermediate
states.
