Inside a narrow rift along the western margin of the Þingvellir Vallley. North American Plate to the left; Eurasian Plate to the right.
A different perspective, from lower down on the volcano.
Columnar basalt at a seaside location in County Antrim.
Some basalt showing a well-developed weathering rind and columnar jointing.
Found cropping out along the beach at Barns Ness, east of Dunbar, Scotland.
Collected on the northeast side of Ronas Hill adjacent to a Devonian dike.
Obverse of this sample:
Ultramafic rocks have experienced faulting at this southernmost spot where geologists are in the Idahoan part of the Pacific Time Zone.
Collected from a dike on the east side of Ronas Hill.
Dike that cross-cuts schist, north side of the beach.
Folded turbidites of the Smaull Greywacke at Saligo Bay, Islay, Scotland.
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