Skeletal - Calcareous Algae - Green Calcareous Algae (Al/7/Penn/Ariz)
 2.5x
|
 2.5x cross nicols
|
 2.5x wave plate
|
| Outstanding feature |
Abundant algal plates |
| Folk Classification |
Algal plate biosparite |
| Dunham Classification |
Algal plate grainstone |
| Common Grains |
Calcareous algal plates |
| Sorting |
Poorly sorted |
| Rounding |
No rounding |
| Micritization & envelopes |
Micrite binds the algal layers |
| Cement & diagenetic fabric |
Cement is spar filling empty spaces and rimming grains |
| Porosity |
Approximately 30% |
| Depositional Setting |
Probable high-energy beach |
| Diagenetic history |
Exposed to freshwater diagenesis |
A collection of abundant algal plates who's internal pores are still visible. The algal plates are heaped upon each other and are enclosed by thin bladed crusts. Most of the final porosity is filled by equant spar, though there is some porosity that remains unfilled. From the J Harlan Johnson Collection.
Thursday, November 11, 2021