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The San Juan Mountains
The San Juan Mountains are bold, beautiful, and magnificent. They are very large, so large that it is 477+ miles all the way around. They are the most extensive mountains in Colorado. They are located in the southwest, close to the four corners. The San Juan Mountains average elevation is 13,363 feet tall.

The San Juan Mountains are mainly formed by volcanic rock over twenty-eight million years ago. The San Juan Mountains consist of three distinctive areas. The largest area is covered by volcanic rock. To the southwest of the volcanic area, igneous and metamorphic rocks are exposed. Igneous and metamorphic rocks are surrounding sedimentary layered rocks. __ [] __

The San Juan Mountains are tall, they are blunt and worn down from years and years of Erosion. The San Juan is made of volcanoes. When the San Juan was being formed volcanoes were erupting creating chaos for millions of years. Their volcanic fields are almost as big as their perimeter. The San Juan was shaped over billions of years through multiple episodes of mountain building and uplift. Their amazing columns were not just formed that way; weathering and erosion had a big part in making the San Juan what they are today. For example; erosion took away tons of rock as shown in the picture above. There are many places just like this one on the San Juan. Weathering has crushed down the height of the mountains for over a millennia. []

Image from Google earth