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Ambergris Caye Limestone
The uppermost unit in the Airstrip well is 28 m thick, and consists of mostly white and light tan, porous limestones that generally coarsen upwards from wackestones/packstones to pack-stones/grainstones. Constituent particle size and the amount of corals and associated coralline algae, Halimeda, Homotrema and thick-shelled pelecypods and gastropods increase upwards. Of the total vertical section of ca 4�7 m of limestones that was compiled from exposures and excavated and/or dredged samples on and around Ambergris Caye, the basal 2�3 m correlate to the limestone section of the same thickness at the top of the Airstrip well (Fig. 3A). These rocks and the overlying 2�4 m of exposures on and around the caye are included within the Ambergris Caye Limestone to give it a total thickness of ca 30 m. Flores (1952) referred to exposures of coral-rich rocks along the north-eastern coast of Ambergris Caye (e.g. at Reef Point: Fig. 2) as the 'Ambergris reef limestone', from which the name of the present formation is derived.