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It was clear every nook and cranny had been repeatedly picked over for thundereggs. Little round hollows signifying their absence were everywhere.


“A Thunderegg is not actually a rock. It is a structure, sometimes a nodule, sometimes a geode, occurring in rhyolite, welded tuff, or perlitic rocks. However, without question, the Thunderegg is by far the most popular ‘rock’ in Oregon” (

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Taken on March 31, 2012