Meteorite impact ash deposits of ultramafic composition, deposited in a marine setting during the Archean.
To explore a gigapan of the roadcut where this sample was collected, click here:
A different perspective, from lower down on the volcano.
Two samples of ultramafic lava flows from the Archean, showing spinifex texture.
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.
Selected locations showing truncated cross bed sets are labeled.
Not a member yet? Sign up