These bedded scoria layers from Santa Ana were transported intact with only slight disruption about 30 km from the volcano in the Acajutla debris avalanche. A more than 20-m-thick sequence of inter-bedded tephra layers and thin lava flows is exposed in this quarry in an avalanche hummock near Highway 2. The red-and-yellow bars on the scale mark 10-cm increments.

Photo by Paul Kimberly, 1999 (Smithsonian Institution).

Santa Ana