Sentences with graywacke
gray·wacke
G g - Hundreds of projectile points and ceramic pieces from the island are stored in the State Museum in Albany, and archaeologists found human bones at a burial site from the early Woodland period at the back of the rock shelter, a 45-foot-long overhang of graywacke, a local sandstone.
- Sandstones with large amounts of impurities are generally categorized into wacke or graywacke.