On December 6, 1994, during a CIR (Corotating Interaction Region) event, the WIND 3D-Plasma and energetic particle experiment observed a burst (≤24 s) of 238--676 keV protons close to the electron foreshock boundary, followed by a 156--236 keV, 101--156 keV and 33--101 keV proton bursts about ~40 s, 65 s and 85 s later, respectively. Similar dispersed bursts of helium with energies between ~50 keV and ~1 MeV followed the proton bursts. During this time, the IMF direction varied slowly with an almost monotonic decrease in &thgr;Bn. The proton energy spectrum is initially peaked at ~350 keV, and progresses to lower energies with time. The proton 3D angular distributions are peaked at ~30¿ pitch-angle, propagating away from the shock, but they are nongyrotropic. Finally, we show that the proton energy-spectra as well as the pitch angle distribution agree quantitatively with a model of a single adiabatic reflection of the incident energetic interplanetary ions by the quasi-perpendicular shock. ¿ 1999 American Geophysical Union