1. The mountain's primary rock is from the Hayes Butte Basalt flows. 2. The primary rocks are Quartzite overlaid with an irregular slaty formation. 3. The primary rock that makes up the mountain is basalt. 4. Today, sandstone, shale, granite, and serpentine are the primary rock types in the Chetco region. 5. The primary rocks are metamorphic, mostly quartzites and slate. 6. The bedrock is Silurian, primary rock type is Dolostone with Shale being the secondary rock type. 7. Overall, acid and primary rocks resulted in the most radioactive emanation; mafic and sedimentary rocks demonstrated less radioactivity. 8. The primary rock that makes up the mountains is rhyolite which in some areas has been mineralized by geothermal forces. 9. Basalt is the primary rock type at Big Dan, forming part of the Arsenic Lake Formation, the site's major geologic feature. 10. Basalt and andesite are the primary rock types at Beanland, forming part of the Younger Volcanic Complex, the site's major geological feature.
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