The world’s most unique and only lithified parabolic dune field is best exposed in Una-Delvada-Diu region, along southern coastal Saurashtra. The individual dunes are composed of mechanically formed calcium carbonate sediments, formed due to the fragmentation of mollusk shells and coral reefs. Lithification of these well sorted and rounded paletoid sediments by dissolved calcium carbonate has provided very high chemical purity (98% CaCO3). These lithified rocks are part of widespread Quaternary deposits commonly described as Miliolite limestone. The origin of these deposits has been debated in the past. One group believes they are of marine origin, while the others advanced an aeolian origin. The present study considers that all the sediments formed in marine, very high-energy beach environment. However, their deposition took place by both aeolian as well as marine processes. Parabolic dunes and pile-ups on the western and south-western sides of hills were deposited by aeolian processes, during the arid conditions, corresponding with glacial periods. During these periods, sea levels went down and exposed the beach sediments to be transported to interior regions by strong winds. In contrast the intervening humid interglacial periods were marked by the rise in sea levels, flooding of the coastal plains and valley portions, where the inter-bedded sequence of coarse and fine fractions were deposited under rhythmic, agitated and calmer conditions, along with mega fossils of gastropods, lamellibranches and echinoderms. Dominant prevalence of southwesterly winds is deduced during the entire Quaternary Era. It has vibrant white and yellow color, uniform texture, very suitable for intricate carving, easy quarrying along laminations and sawed to desired dimensions. These represent relatively rare, attractive and unique geological features. As deduced from the multi dated satellite data it is seen that the outcrops of the parabolic dunes are vanishing very fast in recent years due to indiscriminate quarrying as well to reclaim agricultural fields. There is an urgent need to identify an area where they can be best preserved as a geoheritage site for future generations. Furthermore, this pelletoid unit is also an excellent heritage stone, being used for centuries in construction of buildings not only in Saurashtra but also in far off places such as Mumbai and Yangon. Scope for linking this site with other geo-heritage locations in its vicinity is also discussed.