Microscopic

Skeletal - Calcareous Algae - Green Calcareous Algae (Al/15/Jur/Colo)

2.5x
2.5x cross nicols
2.5x wave plate
2.5x
2.5x cross nicols
2.5x wave plate
Outstanding feature Striking example of Chara sp
Folk Classification Chara biomicrite
Dunham Classification Chara wackestone to packstone
Common Grains Calcareous green algae chara with fragments of pelecypods
Sorting Poor
Rounding Irregular
Micritization & envelopes Common
Cement & diagenetic fabric Micrite
Porosity None
Depositional Setting Low energy open marine setting
Diagenetic history Marine aragonite fans & micrite cementation

Collected by Harlan Johnson and representative of Chara Limestone from the Morison formation. Algal head of calcareous green algae Chara & fragments of pelecypods cemented with aragonite fans. 


Thursday, August 06, 2020
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