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Stromatolites. Tumbiana Formation.

The Tumbiana Formation is a 2.7 billion year old series of sandstones interlayered with volcanogenic siltstone that outcrops along the southern margin of the Pilbara Craton in Western Australia.

Stromatolites are abundant in the sediments that were deposited in a shallow marine or lacustrine environment associated with the influx of riverine fresh water.

Associated rock types include pisolitic tuff, siliceous limestone and dolomite, mudstone, tuffaceous shale, siltstone, sandstone, volcaniclastic sandstone and siltstone, calcareous sandstone, local basalt and basaltic breccia, chert, local conglomerate, shale and jasper.