  The stability of a vortex glass phase with quasi-long-range positional order
is examined for a disordered layered superconductor. The role of topological
defects is investigated using a detailed scaling argument, supplemented by a
variational calculation. The results indicate that topological order is
preserved for a {\em wide range} of parameters in the vortex glass phase. The
extent of the stability regime is given in terms of a simple Lindemann-like
criterion.
