Randomly Interpenetrating Radial Calcitic Ooids(O/31)

2.5 cross nicols
10x wave plate
10x wave plate
2.5 wave plate
5x wave plate
5x wave plate
Outstanding feature Radial calcitic ooids, crinoid ossicles and blocky equant spar
Folk Classification Oosparite
Dunham Classification Oolitic Grainstone
Common Grains Ooids, & crinoid ossicles
Sorting Good
Rounding Good
Micritization & envelopes Most grains
Cement & diagenetic fabric Bladed isopachus rims & equant spar overgrowths on crinoids
Porosity Dense
Depositional Setting Open marine high energy shoal water
Diagenetic history Cemented by large equant spar, much of it overgrowths on echinoids

Sparse isopachus rim cements are probably related to initial freshwater cements that originated from dissolution of original aragonite and calcite. The radial calcite ooids accumulated adjacent to a high energy setting. Note radial character of the crystals in the ooid layering is somewhat obscure. Darkened spots within bioclastic layers are after cyanobacteria colonies that caused local micritization. Note the well developed large calcite spar overgrowths on echinoid fragments.

Thursday, November 11, 2021
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