The clean white sucrosic to microsucrosic dolomites of the Daanbantayan region in North Cebu show, like many other dolomite occurrences in the Philippines, no indications of supratidal, hypersaline origin. They seem to have been deposited in a subtidal shallow marine environment as lime mud which was dolomitised in an early stage of the diagenetic history. Judging from their petrography and geochemistry, these dolomites seem to have been formed by alteration of the original deposits through mixing of marine pore water with surfacial meteoric water.

The present short preliminary study is meant to draw attention to the need for intense studies of dolomitization mechanisms in the widely occurring Late Tertiary to Quatemary dolomites in the Philippines.