South Africa's Archean ultramafic lava flows
A different perspective, from lower down on the volcano.
Two samples of ultramafic lava flows from the Archean, showing spinifex texture.
A view from the top of Grábrók to the east.
South Africa's Archean ultramafic lavas.
Some of the oldest chert in the world.
... of the Little Colorado River, near Leupp, Arizona.
Paleozoic sedimentary rocks atop Precambrian gneisses.
Lichen covers the slopes of a small cinder cone in southwestern Iceland. Taken from the rim of neighboring Grábrók.
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