Spatial Coverage is exactly "Adirondack Highlands-collected from a road cut on NY Routes 10 & 29A, ½ mile north of the Nick Stoner Inn and 1¼ miles south of the Canada Lake Store."
This specimen is typical of the 5-10 foot thick coarse grained layers of glassy quartzites that comprise this formation. In most instances the quartzites are about 90% quartz. Feldspar and garnet are encountered locally. This is presumed to be the…