SCIENTIFIC OBJECTIVES: THE OBJECTIVE OF THIS STUDY IS TO EXPLORE HOW SEVERAL FACTORS CAN INFLUENCE CRATER SIZE-FREQUENCY DISTRIBUTIONS (CSFDS) AND THE RESULTING DERIVED MODEL AGES OF SURFACES ON THE MOON AND MARS. RADIOMETRIC AND COSMIC RAY EXPOSURE AGES OF APOLLO AND LUNA SAMPLES CORRELATED WITH CRATER POPULATIONS ANCHOR THE LUNAR CRATER CHRONOLOGY AND ENABLE SYSTEMS OF CRATER RETENTION AGE ISOCHRONS TO BE DEVELOPED FOR OTHER SOLAR SYSTEM BODIES. MANY ASPECTS OF THIS DATING TECHNIQUE HOWEVER ARE FRAUGHT WITH CHALLENGES RENDERING THE MODELED ABSOLUTE AGES UNCERTAIN; OFTEN EXCEEDING THE AGE RESOLUTION REQUIRED FOR MANY OF THE GEOLOGIC PROBLEMS TO WHICH THEY ARE BEING APPLIED. SOURCES OF UNCERTAINTY INCLUDE: A RANGE OF RADIOMETRIC AND EXPOSURE AGES OBSERVED IN THE SAMPLES ACQUIRED FROM A SINGLE LOCATION WHETHER THE IMPACT RATE HAS BEEN CONSTANT OR DECLINING OVER THE LAST ~3 GA OR EXPERIENCED SPIKES (PARTLY DUE TO A COMPLETE LACK OF SAMPLES FROM SURFACES WITH THE AGE ~1 TO ~3 GA REPRESENTING A SUBSTANTIAL OBSERVATIONAL GAP IN THE CHRONOLOGY) CSFDS THAT VARY SIGNIFICANTLY WITHIN A SINGLE DATED UNIT. IN THIS WORK WE FOCUS ON THE LATER PROBLEM SPECIFICALLY FOCUSING ON THE COPERNICAN (MOON) AND AMAZONIAN (MARS) IMPACT CRATER POPULATIONS AND FACTORS THAT MAY RESULT IN A VARIATION IN THE OBSERVED CSFDS.