StopII, Roadcut Back on the bus, and back to Palmer. At the stop light, turn left onto the Old Glenn Highway. Just past the campground, before the bridge, stop at the roadcut on the left. These rocks are representative of what are called metasedimentary rocks. We observed a wide range in grain size of the rocks, from clay to sand and pebbles.
Some calcite is present filling fractures in the rock.
This rock type is found in outcrop several places around Palmer. The Tsunami Warning Center in Palmer has its seismograph located on an outcrop off the Palmer-Wasilia highway. The new bridge over the river is the reason for the fresh rock faces. Blasting was done to change the road alignment for the new bridge. Note how narrow the river is at this point, as it cuts it way through this hard rock.