  We report the observation of an unusually large number of consecutive spin
pairs in a weakly coupled many-electron GaAs/AlGaAs quantum dot. The pairs are
identified due to pairwise parallel shifts of Coulomb resonances in a
perpendicular magnetic field. Using a nearby quantum point contact for
time-resolved charge detection, the tunneling rates are investigated as a
function of gate voltage and magnetic field. We compare our experimental data
to a single-level transport model and discuss possible reasons for deviations.
