Ooids - Aragonite Cortex Dissolving - Sparse Calcite Cement - Pleistocene (O/16/Ple/Bah)

5x wave plate
Outstanding feature Mix of high energy ooids, grapestones & bioclasts
Folk Classification Well sorted bio-oosparite
Dunham Classification Well sorted bio-oograinstone
Common Grains Ooids, bioclasts and grapstones
Sorting Well sorted
Rounding Well rounded
Micritization & envelopes Ooids & micritization of bioclasts occurs
Cement & diagenetic fabric Freshwater cements
Porosity 10-15% intergranular primary porosity
Depositional Setting High energy shoal
Diagenetic history Freswater diagenesis of aragonite grains

Striking high energy concentric aragonite ooid grains and bioclasts that accumulated on the NW margin of the New Providence Pleistocene high energy shoals. Note the voids within the cortex of ooids that are the product of dissolution related to the influx of freshwater during the uplift and subaerial exposureof these shoals in the Holocene.

Thursday, November 11, 2021
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