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Never Summer Mountains

Mountain range in Colorado, US

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  • 5 chapters

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Through Volcano, Glacier and Lichen

Geology

Most rocks in the Never Summer Mountains are younger than the surrounding Rocky Mountains. Volcanic and intrusive processes 24–29 million years ago created the Never Summer and Rabbit Ears Range to the west. Today, what remains are weathered fragments of much larger volcanoes; primarily igneous granitic formations along with preceding metamorphic content. Most of the highest peaks in the range are granodiorite that was uplifted during the Miocene epoch. The range's highest summit, Mount Richthofen, is the remnant of an andesite volcanic plug. The Nokhu Crags in the north are mostly vertically oriented Pierre Shale dating from Cretaceous times. A large thrust fault underneath the Kawuneeche Valley thrust older Precambrian rocks on top of the younger Cretaceous rocks on the east side of the range. The southern peaks are Miocene-aged granite, and finally Precambrian-aged biotite gneiss and schist.

Beginning two million years ago, glaciers began carving the jagged peaks of the Never Summer Mountains. Successive waves of glaciation continued to reshape the mountains until the Pinedale Glaciation ended twelve-thousand years ago.

The peaks are enormous weathered masses of granitic rock heavily covered with green and orange lichens surrounded on all sides by large fields of talus shed from the original peaks. Many alpine lakes are nestled amongst the peaks. Most woody vegetation is low-growing and stunted. Few trees grow at the higher altitudes and Krummholz abounds.

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