Microscopic

Skeletal - Calcareous Algae - Rhodophytae (Al/14/Ple/Ber)

2.5x
5x
10x
10x
2.5x
5x
Outstanding feature Abundant calcareous red algae
Folk Classification Red calcareous bound-stone algal micrite
Dunham Classification Algal wackestone & boundstone
Common Grains Micrite and algal laminations
Sorting Poor
Rounding Poor
Micritization & envelopes Micrite cements portions of this rock
Cement & diagenetic fabric Micrite cements & leached aragonite grains
Porosity Intra and inter-particle
Depositional Setting Reef bommie from margin of Bermuda
Diagenetic history Grains cemented by micrite & then aragonite leached by fresh water

Sample is from a cored well in Bermuda which penetrates algal reefs that have been cemented and undergone digenesis. Sample includes rhodophytae grains, micrite & gastropod fragments cemented by micrite while aragonite materials are leached by fresh water


Tuesday, April 28, 2020
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