Ancient lakeshores (lake dammed by glacial ice) etched into the valley walls.
Barberton Greenstone Belt, South Africa
Ancient lava flow.
Belt Supergroup, northwestern Montana
Nice example of mineralized vesicles.
Barberton Mountain Land, South Africa
Sheared-out rock. Obverse of this sample: gigapan.com/gigapans/190235
Columnar basalt at a seaside location in County Antrim.
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