- November 2011
Region: Rocky Mountain Region
Location: Florissant, CO
Link: NPS website
Passport Description: This beautiful mountain valley just west of Pikes Peak holds huge petrified redwoods and detailed fossils of ancient insects and plants. Almost 35 million years ago, enormous volcanic eruptions buried the valley. A lake formed, and the fine-grained sediments at its bottom compacted into layers of shale preserving the delicate organisms as fossils.
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