Microscopic

Skeletal - Gastropodia - Vermitid (B/5/Hol/Bah)

2.5x
5x
5x cross nicol
2.5x
2.5x
2.5x wave plate
5x
10x
2.5x
Outstanding feature Vermitid gastropods & clione bores
Folk Classification Porous vermitid gastropod biomicrite
Dunham Classification Porous vermitid gastropod packstone
Common Grains Vermitid gastropods & mollusc debries
Sorting Poor
Rounding None
Micritization & envelopes Some alteration of grain boundaries
Cement & diagenetic fabric Micrite cementation
Porosity 35-40% interparticle
Depositional Setting Reef bommie from near shore
Diagenetic history Marine micritization & cementation

This is from part of a vermiculid reef formed in the near shore area near to Nicolstown of Andros Island in the Bahamas


Thursday, August 06, 2020
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