Pebble from conglomerate faulted into form of a tiny graben, Scottish Highlands


I collected this rock in 2008 in the Scottish Highlands where the Old Red Sandstone is cut and displaced by the Highland Boundary fault. I was on a field trip led by Midland Valley Exploration, Ltd.  I like the fact that this pebble is a miniature thumbnail of the kind of faulting that can deform regions.  Besides, how often can you carry a graben around with you in your pocket?

Age & Formation
from the Old Red Sandstone, Devonian age, ~380 Ma.
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