page_title: Stillaguamish Peak
section_title: Geology
hierarchical_section_title: Stillaguamish Peak / Geology
caption_attribution_description: English: Stillaguamish Peak and Mt. Baker seen from Dickerman Mountain
context_page_description: Stillaguamish Peak is a 5,720+ ft mountain summit near the western edge of the North Cascades, in Snohomish County of Washington state. It is located five miles north-northwest of Barlow Pass near the Monte Cristo area, and is situated on land administered by the Mount Baker-Snoqualmie National Forest. It rises 4,000 feet above the Stillaguamish River and the Mountain Loop Highway.
context_section_description: The North Cascades features some of the most rugged topography in the Cascade Range with craggy peaks, 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 various climate differences. These climate differences lead to vegetation variety defining the ecoregions in this area.
  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. Glacier Peak, a stratovolcano that is 17.22 mi (27.71 km) east of Stillaguamish Peak, began forming in the mid-Pleistocene. 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 the landscape leaving deposits of rock debris. 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: Stillaguamish and Baker from Dickerman
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