Ooids Replaced by Chert ( O/41/Ord/Pa )
 2.5x
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 2.5x wave plate
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 5x
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 5x cross nicols
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 5x wave plate
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 10x cross nicols
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 10x wave plate
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| Outstanding feature | Chert replaces radial ooids & fibrous cement |
| Folk Classification | Chertified Oosparite |
| Dunham Classification | Chertified Oograinstone |
| Common Grains | Ooids |
| Sorting | Well Rounded |
| Rounding | Well Sorted |
| Micritization & envelopes | Grains at nucleae have micrite envelopes |
| Cement & diagenetic fabric | Almost complete replacement by chert |
| Porosity | 1% intercrystalline |
| Depositional Setting | High energy shoal |
| Diagenetic history | Complete chertification of ooid cortex & cement |
Striking replacement of radial calcitic ooid cortex concentricly layered about nucleae of both an mozaic of equant authogenic quartz and larger original felspar and quartz grains.
Thursday, November 11, 2021