South Africa's Archean ultramafic lavas.
Oldest rock in the North West Highlands
Barberton Greenstone Belt, South Africa
Limestone (calcite) and dolostone (dolomite) layers weather at different rates.
Nice fine sandstone with a stack of cross-bedded packages.
"Grind" means gate - here, during the biggest, storms, waves ramp up and crash through the gate, ripping out huge boulders of ignimbrite and piling them up inland as a crazy storm beach.
Columnar basalt above a beach of black sand.
Cretaceous deep water clastics.
Obverse of this sample: gigapan.com/gigapans/185276
3D model of this sample: sketchfab.com/models/7fe94fbacda948beaae4737afb2f589c
Found cropping out along the beach at Barns Ness, east of Dunbar, Scotland.
LiDAR data and processing courtesy of Dan Doctor, USGS
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