  Unconventional Weyl points with topological charges higher than 1 can
transform into various complex unconventional Weyl exceptional contours under
non-Hermitian perturbations. However, theoretical studies of these exceptional
contours have been limited to tight-binding models. Here, we propose to realize
unconventional Weyl exceptional contours in photonic continua -- non-Hermitian
anisotropic chiral plasma, based on ab initio calculation by Maxwell's
equations. By perturbing in-plane permittivity, an unconventional Weyl point
can transform into a quadratic Weyl exceptional circle, a Type-I Weyl
exceptional chain with one chain point, a Type-II Weyl exceptional chain with
two chain points, or other forms. Realistic metamaterials with effective
constitutive parameters are proposed to implement these unconventional Weyl
exceptional contours. Our work paves a way toward exploration of exotic physics
of unconventional Weyl exceptional contours in non-Hermitian topological
photonic continua.
