The high spots in the valley floor are marble bedrock outcrops or, plainly put, marble hills, where rare plants grow. Watch for several greenish-gray roadcuts. These are Cambrian-Ordovician Stockbridge marble. In addition, there are some exposed dark schists. The valley is comparatively broad at this point.
East Mountain is held up by hard gneisses and quartzite.
Park by the playground. There is a huge lawn to the east. Often people run their motorized toy planes here. You are going to walk to the northeast section of this huge lawn area at the base of the mountain. You pick up a trail here that will take you to the top and then southward to a overlook platform.