Geology you can hold in your hand.
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:
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.
Nice fine sandstone with a stack of cross-bedded packages.
A nice example of cross-stratification in a fine sandstone
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