  We prove a topological criterion for the existence of zero-energy Majorana
bound-state on a disclination, a rotation symmetry breaking point defect, in
4-fold symmetric topological crystalline superconductors (TCS). We first
establish a complete topological classification of TCS using the Chern
invariant and three integral rotation invariants. By analytically and
numerically studying disclinations, we algebraically deduce a Z_2-index that
identifies the parity of the number of Majorana zero-modes at a disclination.
Surprisingly, we also find weakly-protected Majorana fermions bound at the
corners of superconductors with trivial Chern and weak invariants.
