Grapestones & Echinoid with overgrowths (Int/9)

2.5 cross nicols
2.5 wave plate
5x wave plate
Outstanding feature Grapestones & echinoids with overgrowths calcite spar cement
Folk Classification Skeletal bimodal poorly washed intrasparite
Dunham Classification Skeletal bimodal intraclastic packstone
Common Grains Grapestones & echinoids
Sorting Bimodal
Rounding Mixed well rounded to angular
Micritization & envelopes Micritized grapestones & bioclasts
Cement & diagenetic fabric Mixed spar (some overgrowths) and micrite cements
Porosity None
Depositional Setting High to moderate energy shoal
Diagenetic history Early micrite followed by spar cements

Skeletal bimodal poorly washed intrasparite from a high to moderate energy shoal. Later the mcrites bind the grapestones & then equant calcite spar cement precipitates when the echinoids develop overgrowths of the same cement

Thursday, November 11, 2021
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