  Using new HST imaging, we identify a large, evolved system of super star
clusters in a disk region just outside the starburst core in the prototypical
starburst galaxy M82, ``M82 B.'' This region has been suspected to be a fossil
starburst site in which an intense episode of star formation occurred over 100
Myr ago, which is now confirmed by our derived age distribution. It 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.
