Fig Tree Group
Meteorite impact ash deposits of ultramafic composition, deposited in a marine setting during the Archean.
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.
Stem with needles, or a raggedy cone (?), Conemaugh Formation, Corridor H.
Lichen covers the slopes of a small cinder cone in southwestern Iceland. Taken from the rim of neighboring Grábrók.
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