The origin of the ooids forming the bulk of many large Pleistocene and Holocene ridges on the windward islands of Great Bahama Bank is not well understood. A formation locus situated to the east of these islands would be consistent with present-day sediment fluxes, but outer platforms in these areas are extremely narrow today and appear unsuitable for large-scale ooid production. The four models presented hereafter suggest that ooids could originate (1) from these narrow outer platforms, (2) from wider outer platforms that no longer exist, (3) from the bank interior via tidal channels, and (4) directly from the bank interior by means of a westerly sediment flux. With the exception of option #3, all models are validated by field observations in Eleuthera and in the Exumas. Corroboration of models #2 (outer platform erosion) and # 4 (westerly flux) further indicates that past depositional environments and sedimentary processes on Great Bahama Bank could have been significantly different from those operating today.