Mesoproterozoic Era, 1.6-1 billion years BP. A polished slice of Conophyton garganicum australe stromatolite. 230 grams, 13.5cm (5 1/4"). From a Leicestershire, UK, collection; acquired on the Australian market; from Bangemall Basin, Ashburton region, Western Australia; accompanied by an identification label to the reverse. Stromatolites are layered mounds of rock-like structures, usually forming in shallow waters. They are formed by growth of bacteria and single-celled algae. [No Reserve]