Microscopic

Chertification (B111/K/Tx )

2.5x
2.5x cross nicols
2.5x wave plate
5x
5x wave plate
2.5
2.5x wave plate
5x
5x wave plate
Outstanding feature Chert replaces bioclastic grains & micrite and spar cement
Folk Classification Chertified foraminifera biomicrite
Dunham Classification Chertified foraminifera packstone
Common Grains Foraminifera, intraclasts & micrite envelopes
Sorting Well sorted
Rounding Well rounded
Micritization & envelopes Micrite envelopes common
Cement & diagenetic fabric Almost complete replacement by chert
Porosity No porosity
Depositional Setting High energy shoal
Diagenetic history Chertification of skeleletal grains and micrite cement
Replacement of skeletal and micritic materials by chert.

Wednesday, August 05, 2020
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