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quartz and chert
Approximate dimensions at widest points 235 mm x 140 mm x 13 mm thick
Dimensions approximately 180 mm x 70 mm x 7 mm thick
Dimensions approximately 130mm x 100mm x 7mm thick
Highly polished on both sides
Polished fossil stromatolite. Pseudogymnosolenid type. DOG167 fossil stromatolite quartz and chertDOG167 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 60 mm x 8. 5 mm thick.
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