Interpenetrating Radial Ooids - Echinoid Overgrowths - Mississippian (O/26/Miss/Col)
 2.5x
|
 5x
|
 5x
|
 2.5 cross nicols
|
 5x cross nicol
|
 2.5 wave plate
|
 5x wave plate
|
| Outstanding feature |
Loosely packed interpenetrating high oomicrite, echinoids with overgrowths |
| Folk Classification |
Poorly washed oomicrite with echinoids |
| Dunham Classification |
Oopackstone |
| Common Grains |
Ooids and echioid fragments |
| Sorting |
Bimodal sortingof sand & silt sizes |
| Rounding |
Well rounded |
| Micritization & envelopes |
Common micritizaton of grains |
| Cement & diagenetic fabric |
Calcite overgrowths on echinoids |
| Porosity |
Dense |
| Depositional Setting |
High energy shoreline |
| Diagenetic history |
Larger calcite crystals on echinoids |
Radial high energy ooid grains. Note the fine carbonate silt to fine sand matrex supporting the ooids. Also note the calcite overgrowths on the echinoid fragments.
Thursday, November 11, 2021