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This beautiful specimen has been cut perpendicular to the colonies and polished to a mirror finish on the side shown. The specimen measures 147 by 85 mm and is 5 mm thick.
Baicalia sp. is putative bacteria believed to have been photosynthetic prokaryotes that oxidised ambient iron and other heavy metals as part of their metabolism pathways. The presence of the metals is in solution for precipitation is tangible evidence that Precambrian times had extensive volcanic activity.
£48 ($79 €69)