Microscopic

Chertification (B/109/Pen/Tx )

2.5x
2.5x wave plate
5x
5x wave plate
5x
5x wave plate
Outstanding feature Chert replaces bioclastic grains & micrite and spar cement
Folk Classification Chertified coral biomicrite
Dunham Classification Chertified coral packstone
Common Grains Crinoid ossicles
Sorting Poorly sorted
Rounding Well rounded to angular
Micritization & envelopes Micrite envelopes common
Cement & diagenetic fabric Partial replacement by chert
Porosity 1% intercrystalline & fracture
Depositional Setting Low energy trap close to high energy
Diagenetic history Partial chertification of skeleletal grains and micrite cement
Replacement of skeletal and micritic materials by chert.

Tuesday, April 28, 2020
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