Grapestones & Echinoid with overgrowths (Int/9)
 10x
|
 2.5x
|
 5x
|
 5x
|
 2.5 cross nicols
|
 2.5 wave plate
|
 5x wave plate
|
| Outstanding feature |
Grapestones & echinoids with overgrowths calcite spar cement |
| Folk Classification |
Skeletal bimodal poorly washed intrasparite |
| Dunham Classification |
Skeletal bimodal intraclastic packstone |
| Common Grains |
Grapestones & echinoids |
| Sorting |
Bimodal |
| Rounding |
Mixed well rounded to angular |
| Micritization & envelopes |
Micritized grapestones & bioclasts |
| Cement & diagenetic fabric |
Mixed spar (some overgrowths) and micrite cements |
| Porosity |
None |
| Depositional Setting |
High to moderate energy shoal |
| Diagenetic history |
Early micrite followed by spar cements |
Skeletal bimodal poorly washed intrasparite from a high to moderate energy shoal. Later the mcrites bind the grapestones & then equant calcite spar cement precipitates when the echinoids develop overgrowths of the same cement
Thursday, November 11, 2021