Three beach ridge sets, lying discontinuously along the mainland coast of Gulf and Franklin counties, are composed of large amplitude beach ridges, with individual beach ridges parallel with each other in each beach ridge set. Plots of mean-cubed deviation versus standard deviation, standard deviation versus skewness, and probability plots as well as the grain roundness Indicate that these beach ridges were formed primarily by marine processes: swash action on the beach face, rather then by eolian process. Point-by-point examination of the data reveals that there is a consistent decrease In mean grain size toward the west, Indicating that there was westward longshore drift. The eastern beach ridge set (Carrabelle beach ridge set) has rather different moment measure results than the other two beach ridge sets. This may indicate that it had a different sediment pool. Plots of mean grain size versus distance, standard deviation versus distance, kurtos is versus distance for all the three beach ridge show similar trends of change. Grain size is coarser in the older beach ridges, finer in the center of the beach ridge plain and coarser again in the younger beach ridges. The standard deviation value became larger as time passed whereas the kurtosis value decreased progressively. This may indicates that the wave energy gradually decreased and the sand pool was gradually being used up. According to their stratigraphic and physiographic relationship with the known-age geologic bodies, and the calculation of age by slope angles, the beach ridges were formed in Sangamon time(around 100,000 years before present time).