Global Volcanism Program | Image GVP-01505
Geologists examine a quarry in a post-caldera cone of the Vulsini volcanic complex. The base of the quarry exposes thick, red-colored scoria deposits produced by Strombolian eruptions that built a scoria cone. These are overlain by bedded, yellowish pyroclastic surge deposits.
Photo by Richard Waitt, 1985 (U.S. Geological Survey).