  Under the influence of oscillatory shear, a mono-layer of frictional granular
disks exhibits two dynamical phase transitions: a transition from an initially
disordered state to an ordered crystalline state, and a dynamic
active-absorbing phase transition. Although there is no reason, {\it a-priori},
for these to be at the same critical point, they are. The transitions may also
be characterized by the disk trajectories, which are non-trivial loops breaking
time-reversal invariance.
