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Protodolomite is found in the sediments beneath hammocks of the tidal flats of west-central Andros Island, Bahamas. The protodolomite is disordered, contains 38-44 mole percent MgCO3, occurs as 1 μm equant rhombs, and fills pores between and grows around aragonite needles.

The tidal flats are composed of Holocene lime sediments which overlie Pleistocene limestones, forming a wedge 0-4 m thick. The tidal flat wedge has prograded westwards several km into a slightly hypersaline shallow water bank which resembles an epeiric sea in aerial dimensions. Elevated ridges (hammocks), are common features on the tidal flats. They are underlain...

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