Striking Pleistocene high energy concentric aragonite ooid grains that accumulated on tidal deltas formed in the vicinity of Le Jeune, Miami Florida. Note the empty pores within the ooids that are the product of dissolution of aragonite cortex by freshwater. The remanents of mucilagenous material secreted by cyanobacteria now form the dark layers in the dissolved ooids and should act as the template for later cement fill if that should eventually fill these voids. The earlier carbonate that has is dissolved is currently reprecipitated as a low magnesium calcite spar matrex.