Microscopic

Skeletal - Bryozoan, Brachiopods, Echinoids & Trilobites (B/36/Ord/Ohio)

2.5x
5x
2.5x
2.5x
2.5x
5x cross nicols
5x
5x cross nicols
Outstanding feature Bryozoan fragments in fine matrix
Folk Classification Bryozoan poorly washed biosparite
Dunham Classification Bryozoan packstone
Common Grains Bryozoan, Brachiopods, Echinoids & Trilobites in a lime mud matrix
Sorting Bimodal
Rounding Moderarately rounded
Micritization & envelopes None
Cement & diagenetic fabric Some spar dispersed in the mud
Porosity None
Depositional Setting Quiet water close to higher energy
Diagenetic history High Mg calcite resists alteration

This sample of the Ordovician of Ohio is from an outcrop in the vicinity of Cinncinnatti from the Maysville Group. The setting was a shallow shelf which was sorted by storm waves that disarticulated the brachipods and broke up the skeletal materials. The mixed matrix is derived from to a mix of storm derived mud and the skeletal grains that were broken by the storms!


Tuesday, April 28, 2020
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