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The environment they grew in was possibly freshwater algal marshes
Weight is 578 grams
Dimensions approximately 340 mm x 180 mm x 9
Dimensions at widest points approximately 45 mm x 40 mm x 6
Magnetite cones
Polished fossil stromatolite. Alcheringa narrina. ALC157 stripey jasper The environment they grew inALC157 Fossil stromatolite , polished on one side with natural weathered exterior on rear. Alcheringa narrina from the Archaean Meentheena Member within the Tumbiana Formation. Age is approx. 2. 7 billion years. From near Nullagine in Western Australia. Dimensions at widest points approx. 185 mm x 95 mm x 30 mm thick. Weighs 678 grams.
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