Munjina  Stone

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"Munjina Stone” is from the Chichester Ranges in the Pilbara region of Western Australia, approx. 800 miles N. of the capital, Perth.

It occurs in the Jeerinah Formation which is part of the Fortescue Group in the Hamersley Basin.  Age is late Archaean & was deposited between 2765 & 2687  million years ago

It is a silicified pelite (mudstone)