This study forms part of an ongoing attempt to understand and employ the iodine xenon system as a chronometer. This work addresses issues that previous work has brought to light. By studying samples of primitive LL chondrites (Bishunpur LL3.1, and Kiymka LL3.1), 1 have investigated whether I-Xe ages in these meteorites date formation or post-formation processes, and have explored the causes of post-formation resetting. The results of this study indicate that late chondrule I-Xe ages in LL3 chondrites reflect resetting events caused by collisions, not formation.