Sin título de diapositiva


	The Teteltzingo avalanche-lahar appears to be a single massive, unbedded, poorly sorted mixture of heterolithologic pebbles, cobbles, and boulders supported within a characteristic yellow-brown, clayey, silty sand matrix that contains small vesicles suggestive of air bubbles trapped in a water-saturated matrix. Hydrothermal alteration on the matrix is extensive and dominant in the whole deposit.
	The deposit's features suggest that it had an origin as a sector collapse of weakened, water-saturated hydrothermally altered rock that transformed from a debris avalanche to a cohesive lahar very close to its source, similar to the Osceola lahar (Vallance and Scott, 1997).
	In this picture you can see very large boulders that were transported to this location at 65 km from the source area.