  The gauge transformation properties of the Skyrme--Chern-Simons (SCS)
densities is studied. Two types of SCS actions are identified, Type_{I} in
which the gauge group is smaller than the largest possible one, and Type_{II}
which are gauged with the largest allowed gauge group. Type_{I} SCS feature
only one power of the gauge connection and no curvature, while Type_{II}
feature both the gauge connection and the curvature. The Abelian Type_{I} SCS
turn out to be explicitly gauge invariant while non-Abelian Type_{I} and all
Type_{II} SCS are gauge invariant only up to a total divergence term, and hence
lead to gauge covariant equations of motion. SCS actions are the gauged
Skyrmion analogues of the usual Chern-Simons (CS) actions, except that unlike
the CS which are defined only in odd dimensions, the SCS are defined also in
even dimensions. Some areas of application in the construction of solitons are
pointed out.
