Skeletal - Calcareous Algae - Cyanobacteria (Al/12/Dev/WAust)
 2.5x
|
 2.5x cross nicols
|
 2.5x wave plate
|
 5x
|
 5x cross nicols
|
 2.5x
|
| Outstanding feature |
Algal head flanked by sediment |
| Folk Classification |
Algal biolithite & biomicrite |
| Dunham Classification |
Laminated algal oundstone/bioclastic packstones & wackestones |
| Common Grains |
Renalcis grains, pelecypod, brachiopod, & cephalopod fragments |
| Sorting |
Bi-model sorting of well sorted bioclastic grains |
| Rounding |
micrite matrix |
| Micritization & envelopes |
|
| Cement & diagenetic fabric |
Micrite & some corrosion of margins of stromatolite |
| Porosity |
None |
| Depositional Setting |
Surface of subtidal algal bioherm from Canning Basin |
| Diagenetic history |
Micritization within algal head |
A fragment of an algal stromatolite head enclosed by onlapping sediment composed of a combination Renalcis grains, pelecypod, brachiopod, & cephlapod fragments, that all fill the grooves between the heads. This sample of Devonian Fammenian carbonate was collected from the surface of a large algal mound 15 to 30 meters across, that formed in subtidal waters of the northern margin of the Canning Basin of Western Australia. Phil Playford named these carbonate mounds in the Canning Basin, Western Australia, the No 2 Elimberrie Bioherms.
Thursday, November 11, 2021