Geometric finiteness in negatively pinched Hadamard manifolds

In this paper, we generalize Bonahon’s characterization of geometrically infinite torsion-free discrete subgroups of PSL(2, $\mathbb{C}$) to geometrically infinite discrete subgroups $\mathrm{\Gamma }$ of isometries of negatively pinched Hadamard manifolds $X$. We then generalize a theorem of Bishop to prove that every discrete geometrically infinite isometry subgroup $\mathrm{\Gamma }$ has a set of nonconical limit points with the cardinality of the continuum.