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.
Alken/Mosel (Kreis Mayen-Koblenz, Rheinland-Pfalz)
in der "Blauen Stunde".
Double-terminated quartz crystals, sometimes called Herkimer diamonds, from the Ace of Diamonds mine in Herkimer, New York.
"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.
orthophoto of Oso landslide from imagery acquired July 7th, 2015 and merged in Agisoft Photoscan
Cretaceous deep water clastics.
Obverse of this sample: gigapan.com/gigapans/185276
3D model of this sample: sketchfab.com/models/7fe94fbacda948beaae4737afb2f589c
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