  (Abridged) We present high-resolution HST imaging in the optical (WFPC2) and
near-infrared (NICMOS) of a disk region 1 kpc NE of the starburst core in the
nearby galaxy M82. This region, M82 ``B,'' has been suspected to be a fossil
starburst site in which an intense episode of star formation occurred over 100
Myr ago, and our new observations confirm this intepretation. We find a large,
evolved system of super star clusters in M82 B; we identify a total of 113
super star cluster candidates. The clusters range in absolute magnitude from
M_V^0 = -6 to -10, with a peak at -7.5. The derived age distribution suggests
steady, continuing cluster formation at a modest rate at early times (> 2 Gyr
ago), followed by a concentrated formation episode ~600 Myr ago and more recent
suppression of cluster formation. The peak episode coincides with independent
dynamical estimates for the last tidal encounter with M81. Our J and H band
observations resolve the bright giant population in M82's disk for the first
time. Star formation evidently continued in M82 B until about 20-30 Myr ago,
but none is found associated with the youngest generations in the nuclear
starburst (age <= 15 Myr). After correcting the cluster luminosity function to
a fiducial age of 50 Myr, we find that the bright end is characterized by a
power-law slope with alpha = -1.2 +/- 0.3. Cluster sizes (2.34 <= Reff <= 10
pc, or 2.4 <= Rcore <= 7.9 pc) and estimated masses (a median of 10^5 Msun) are
consistent with values found for young super star cluster populations in M82's
core and other galaxies and with the progenitors of globular clusters.
