  We observe new Feshbach resonances in ultracold mixtures of $^{85}$Rb and
$^{87}$Rb atoms in the $^{85}$Rb$|2, +2\rangle$+$^{87}$Rb$|1, +1\rangle$ and
$^{85}$Rb$|2, -2\rangle$+$^{87}$Rb$|1, -1\rangle$ scattering channels. The
positions and properties of the resonances are predicted and characterized
using the semi-analytic multichannel quantum-defect theory by Gao. Of
particular interest, a number of broad entrance-channel dominated p-wave
resonances are identified, implicating exciting opportunities for studying a
variety of p-wave interaction dominated physics.
