Ashfall Tuff

Ashfall Tuff is a type of volcanic rock formed when volcanic ash from a large eruption settles and solidifies, creating porous, lightweight deposits. When a volcano erupts violently, it ejects ash into the atmosphere, which then falls back to the ground. Over time, layers of this ash compacts and cements together, forming tuff. Ashfall Tuff can cover extensive areas, revealing past volcanic activity and serving as valuable clues in understanding a volcano’s history. Its porous nature makes it less dense than other rocks, and it often contains fragments of volcanic glass and crystals.