Packed Radial Calcitic Ooids - Spar Replaces Grains - Pennsylvanian (O/21/Pa NMx)

2.5 cross nicols
2.5 cross nicols
5x cross nicol
10x wave plate
2.5 wave plate
5x wave plate
5x wave plate
Outstanding feature Tightly packed interpenetrating high energy radial ooids & sparse equant spar
Folk Classification Packed well sorted radial ooidsparite
Dunham Classification Radial oograinstone
Common Grains Ooids, & and echinoid fragments
Sorting Well sorted
Rounding Well rounded
Micritization & envelopes Common micritizaton of ooids
Cement & diagenetic fabric Radial calcite replacing ooid fabric and cement consuming grains.
Porosity Dense
Depositional Setting High energy shoreline
Diagenetic history Larger calcite crystals replacing matrix

Striking radial high energy ooid grains formed on the eastern margin of the sea which now is matched by the Sacramento Mountains. Note the mix of radial calcitic coats and concentric coats and how the radial fabric appears to be replacing the enclosing more micritic surface to these grains.

Thursday, November 11, 2021
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