Columnar basalt at a seaside location in County Antrim.
Incredible ripples (gravel dunes), deposited subaqueously in the channel of the Columbia River Gorge near Quincy, Washington.
West of Quincy, there are big gravel dunes deposited subaqueously by the Glacial Lake Missoula outburst floods.
Fossil gas bubbles (vesicles) in this ancient lava flow were later infilled with mineral deposits, making amygdules.
From a feeder dike cross-cutting Blue Ridge basement complex gneiss (GigaPan: gigapan.com/gigapans/185483) east of Linden, Virginia, exposed on the westbound right side of I-66, at mile marker 16.3.
... in Lava Beds National Monument.
Shot in columns, left to right. Rain began mid-shoot. Spent second half of the GigaPan holding an umbrella over the camera.
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