For this week’s “Monday Geology Picture” here’s a shot of a pretty granite boulder that I spotted during a forest hike in the Constantia region of the Cape Town, South Africa. No doubt, this boulder consists of ~550 million year old Cape Granite. There’s no scale in this picture, but the boulder is about 2 meters wide.
Georneys 
If you go to Indonesia, especially on the island of Papua, you can find granite gravel 1250 million years old (pre-Cambrian – Meso-Proterozoic: Ectasian).
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