Title:New Clues to the Evolution of the Globular Cluster Mass Function Abstract: The initial star cluster mass function as found in interacting and star-forming galaxies is distinctly different from the mass function of old globular clusters. The root cause(s) of this transformation are still not well understood, and this is a heavily debated area of current study. Intermediate-age (1-5 Gyr) merger remnant galaxies host globular cluster systems that can provide particularly important clues in this context. I propose to present new results on size measurements of globular clusters in the 3-Gyr old merger remnant galaxy NGC 1316. Star cluster sizes in this system as a function of galactocentric distance, color, and luminosity (mass) yield important and hitherto unknown insights into the evolution of star cluster mass functions.