page_title: Perdition Peak
section_title: Geology
hierarchical_section_title: Perdition Peak / Geology
caption_attribution_description: English: Eldorado Peak and Skagit River seen from North Cascades Highway near Rockport, Washington
context_page_description: Perdition Peak is a 7,675-foot mountain summit located in North Cascades National Park in Skagit County of Washington state. The peak lies 1.33 mi northwest of Dorado Needle and 2.12 mi northwest of Eldorado Peak. It can be seen from the North Cascades Highway west of Marblemount at a road pullout alongside the Skagit River. Perdition Peak is the highest peak of Backbone Ridge, and other peaks on this ridge include In Spirit Point, Cervical Point, Thoracic Point, Lumbar Point, The Sacrum, and The Coccyx. The first ascent of the peak was made on August 27, 1967, by John Roper via the serrated west ridge. Being a doctor, Roper named some of his many first ascents for anatomical parts of the body. Precipitation runoff and glacier meltwater from the mountain drains into tributaries of the Skagit River.
context_section_description: The North Cascades features some of the most rugged topography in the Cascade Range with craggy peaks, spires, ridges, and deep glacial valleys. Geological events occurring many years ago created the diverse topography and drastic elevation changes over the Cascade Range leading to the various climate differences.
  The history of the formation of the Cascade Mountains dates back millions of years ago to the late Eocene Epoch. With the North American Plate overriding the Pacific Plate, episodes of volcanic igneous activity persisted. In addition, small fragments of the oceanic and continental lithosphere called terranes created the North Cascades about 50 million years ago.
  During the Pleistocene period dating back over two million years ago, glaciation advancing and retreating repeatedly scoured and shaped the landscape. A small glacial remnant lies on the south slope of Perdition Peak, whereas the northern slope maintains the more extensive Perdition and Backbone Glaciers. The U-shaped cross section of the river valleys are a result of recent glaciation. Uplift and faulting in combination with glaciation have been the dominant processes which have created the tall peaks and deep valleys of the North Cascades area.
caption: Perdition Peak (left) and Eldorado Peak seen from North Cascades Highway near Rockport, Washington
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