Skeletal - Calcareous Algae - Cyanobacteria (Al/12/Dev/WAust)

2.5x cross nicols
2.5x wave plate
5x cross nicols
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
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