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Abstract

The facies anatomy of the Miami Limestone, a late Pleistocene oolitic limestone, is described and the developmental history of this ooid accumulation is interpreted based on a series of core borings and outcrops. The oolitic portion of the Miami Limestone originated over a quartz sand high which, in turn, unconformably overlies coralline limestone.

The Miami Limestone itself is divisible into two distinct regions based on morphology, a shoal and channel system and a barrier bar, which developed seaward of the shoal and channel system late in the history of the ooid accumulation (Halley and others, 1977). These topographic features show internal organizations and morphologies similar to the tidal bar belts and marine sand belts (respectively) described by Ball (1967). Both of these features are, however, compound features, portions of each having been transformed into stabilized sand flats at least once during the development of the ooid accumulation. Shifting syndepositional topography appears to be responsible for the change between stable sand flat and mobile sand environments.

The change in the character of the Miami ooid accumulation from a tidal bar belt to a marine sand belt and the importance of syndepositional topography in determining the internal organization of the accumulation emphasizes the importance of the classification of ooid accumulations based on observable properties, particularly form and internal structure.

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