Microscopic

Ooids ( O/6/Hol/GSL Ut )

2.5x
2.5x wave plate
5x
5x wave plate
10x
2.5x
5x
5x cross nicols
5x wave plate
10x
10x cross nicols
Outstanding feature High energy radial & concentric ooids & quartz - in with thin isopachus and equant cement
Folk Classification Well sorted quartzose radial and concentric ooids
Dunham Classification Well sorted quartzose radial and concentric ooids
Common Grains Ooids, peloids &quartz
Sorting Well sorted
Rounding Well rounded
Micritization & envelopes A few coated grains and peloids
Cement & diagenetic fabric Radial calcite and concentric aragonite cortex layers about pellet, broken ooid and quartz nuleae
Porosity Loose sediment, very high
Depositional Setting High energy shoreline amid stromatolytes
Diagenetic history Both calcite and aragonite layers collecting on ooid nucleae
Striking high energy ooid grains forming on the south western shore of Great Salt Lake in the vicinity of the northern end of Antelope Island. Note the mix of radial calcitic coats and concentric aragonite coats about the nuceleae.

Monday, August 27, 2018
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