Radial Ooids - Girvanella, Trilobites & Crinoids - Carboniferous (0/34/Carb/Aus)

2.5 cross nicols
5x cross nicol
5x cross nicol
2.5 wave plate
5x wave plate
5x wave plate
Outstanding feature Radial ooids, girvanella, trilobites and crinoids with spar overgrowths
Folk Classification Echinoidal Oosparite
Dunham Classification Echinoidal Oolitic Grainstone
Common Grains Ooids, echinoids, and trilobites
Sorting Good
Rounding Good
Micritization & envelopes Little micritization
Cement & diagenetic fabric Equant spar overgrowths on echinoids
Porosity None
Depositional Setting Open marine high energy setting
Diagenetic history Large equant spar overgrowths

The ooids are interpreted to have accumulated in a high energy open marine setting. Note how the ooids are almost spherulitic in character. The darkened spots within ooid cortex or layers are after cyanobacteria colonies that caused the local micritization. Note the beautiful overgrowths on the crinoid fragments and the neat trilobite hash!!! There is even a colony of Girvanella skulking in the thin section!

Thursday, November 11, 2021
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