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On the road between
Mammoth Hot Springs and Norris Geyser Basin is Sheepeater Cliff, where you will
find an excellent example of columnar jointing in basalt due to shrinkage during
cooling. Following the fishing trail along the Gardner River you pass another
section of the cliff and, after a slight climb, reach a meadow. Rhyolite composes
loose boulders and the cliff across the way. Within the rhyolite are pieces of
basalt that were formed when the basaltic lava was cooled rapidly within the
cooler
rhyolitic lava.