Seismic reflection experiments designed to explore the lower continental crust have raised the problem of distinguishing multiples generated within the shallow sedimentary section and arriving at long travel times from primary events generated deep in the crystalline basement. This problem is investigated for the COCORP Wind River profile in Wyoming, where numerous reflections from 6 to 14 s (two-way travel time) have been suspected of being multiples. One-dimensional synthetic seismograms are generated using an appropriate Q and velocity structure and compared to true amplitude records. The amplitude of multiples generated from within the sedimentary section are far too small to account for the observed deep reflections, since multiples are traveling entirely in the much more attenuating section. The deep reflection horizons in the Wind River profile are primary events from laminar impedance contrasts deep in the crystalline basement.