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from the Proterozoic "Duck Creek Dolomite"
All reasonably uniform in size (roughly 20 - 30 mm diameter} A bulk assortment
cut and polished on one side
The original structure with annular rings visible in this piece
Polished fossil stromatolite. Pseudogymnosolenid type. DOG163 Chrome chalcedony from the Proterozoic "Duck CreekDOG163 Fossil stromatolite slab, polished on one side An as yet unidentified stromatolite, form of Pseudogymnosolenid type. The stromatolite occurs as small digitate columns which are finely laminated. It probably grew in shallow water conditions with intermittent subaerial exposure. From an unassigned unit of the Wyloo Group. Age is approx. 1. 8 billion years. From south west of Newman Western Australia. Approx. 145 mm x 65 mm x 7 mm thick. Weighs