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This being our second field trip I knew that is was going to be an experience. We again met at the school and gathered the class in route to the Castle Mountain Fault Line and back to the Tsunami Warning Center to see just how the earths movement Is registered and how high tech out system here in Palmer, Alaska really is. With a slight detour we caught the class at the parking lot at Arkose Ridge which is composed of sandstone. We first were told what the surrounding rocks were composed of. The Matanuska formation is composed of sandstone, siltstone, and shale underlying the Chickaloon formation which is made up of coal, sandstone, and shale. The Talkeetna Mountains I found were made up of Batholith, which is granitic rock intruded into other sedimentary rock. When he pointed out the actual fault line I was very surprised. I pictured a fault line to be a definite line in the surface, not an area where rocks grind against each other.
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