Microscopic

Chertification ( B/109/Pen/Tx )

2.5x
2.5x cross nicols
5x
5x wave plate
10x
10x wave plate
2.5x
2.5x wave plate
5x
5x wave plate
Outstanding feature Chert replaces bioclastic grains & micrite and spar cement
Folk Classification Chertified spicular biomicrite
Dunham Classification Chertified spicular packstone
Common Grains Spongue spicules and calcispheres
Sorting Poorly sorted
Rounding Well rounded to angular
Micritization & envelopes Micrite envelopes not uncommon
Cement & diagenetic fabric Partial replacement by chert
Porosity 1-4 % leached intraparticle
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.

Thursday, August 15, 2019
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