 It is also part of the Marble Mountain-Trout Creek Hill volcanic field, a little-known Quaternary volcanic field in the southern Cascades of Washington state.The area can be hiked, and can be accessed by roads in the Gifford Pinchot National Forest.One of 13 volcanic cones in the West Crater-Soda Peaks zone, which covers an area of , West Crater is part of a monogenetic volcanic field with basaltic to andesitic volcanic edifices that vary from 360,000 years old to 2,000 years old.