SEDIMENTARY ARCHITECTURE AND MORPHOLOGY OF A DOME DUNE COMPLEX IN HOLOCENE EOLIAN CALCARENITES, SAN SALVADOR ISLAND, BAHAMAS
Wind-ripple strata are disturbed locally by insect burrows. Plant traces and caliche crusts increase in abundance upward and are prevalent in the upper 1-2 m of dome summits. Structures created by climbing adhesion ripples indicate wind-transported sand during rainfall. Crest orientation and northeast climb of adhesion ripples, crest orientation and southwest climb of some wind ripples, and strata of juvenile lobate dunes convex to the southwest show a prevailing southwest flow direction of Holocene Northeast Trade Winds. Coastal moisture rendered the dune sand cohesive so that avalanches or grainflows happened rarely when sand was dry and wind speed and sediment transport fostered the migration of small transverse dunes. Because basal parts of the North Point Member are heavily weathered or lie below present sea level, dune growth on the emergent North Point peninsula during Holocene time is conjectural. In the path of unobstructed trade winds, low mounds of rippled sand enabled growth of small dome, lobate, or perhaps transverse dunes. On this foundation, mature dome dunes merged laterally to build a peninsular ridge.