Microscopic

Grapestone & Peloids (int/18/Miss/Ind)

10x
10x
2.5x
5x
10x wave plate
10x wave plate
5x cross nicol
Outstanding feature Intraclasts, foraminifera & crinoids with calcite spar overgrowths
Folk Classification Poorly washed skeletal intrasparite
Dunham Classification Skeletal intraclastic packstone
Common Grains Intraclasts, foraminifera & crinoids
Sorting Poor
Rounding Poor
Micritization & envelopes Local micrite cement and micritized bioclasts
Cement & diagenetic fabric Mixed early micritic cement and later equant calcite spar and overgrowths
Porosity None
Depositional Setting Moderate energy open marine shelf
Diagenetic history Early micritic cement and later equant calcite spar and overgrowths


Intraclasts, foraminifera & crinoids collect on moderate energy open marine shelf where early micritic cement and later equant calcite spar develops along with overgrowths on crinoid plates and ossicles.


Thursday, August 06, 2020
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