Ooids ( O/2/Hol/Bah )

2.5x cross nicols
5x cross nicols
Outstanding feature High energy concentric aragonite ooids
Folk Classification Well sorted ooids
Dunham Classification Well sorted ooids
Common Grains Ooids
Sorting Well sorted
Rounding Well rounded
Micritization & envelopes A few coated grains
Cement & diagenetic fabric Uncemented
Porosity Unconsolidated sediment, highly porous
Depositional Setting High energy shoal
Diagenetic history Precipitation of aragonite on pellets
Striking high energy concentric aragonite ooid grains collected where they are forming in the vicinity of Joulters Cays on the NE margin of the Great Bahamas Bank. Note the empty pores within the ooids that are the product of dissolution induced by boring cyanobacteria (blue-green algae).

Thursday, November 11, 2021
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