Kilbourne Hole is an old maar volcano. Maar volcanoes are the result of
explosive eruptions of basaltic lava, and look like craters rather than the typical
cones that result from eruptions of silicic lava. Kilbourne Hole is one of the
largest maar volcanoes in the world, about a mile across. The bottom of Kilbourne
Hole turns out to be pretty uninteresting, but the rim is quite nice and there's a
large sand dune on the northeast side of Kilbourne Hole.
Looking north across Kilbourne Hole, 2/20/05. You can see the edge of the sand
dune at right.
This is a small chunk of olivine, an uncommon mineral usually associated with
maar volcanoes. On the east side of Kilbourne Hole, 2/20/05.
Basalt on the rim of Kilbourne Hole, 2/20/05.
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