Participants in a geological field excursion examine the stratigraphy within the Cerro Colorado maar. The outcrop exposes a variety of deposits produced by several episodes of phreatomagmatic activity. The south crater walls here reveal layered tuff deposits and material from the collapse of the inner crater wall into the vent. Steeply dipping dark-colored tuff beds (left) can be traced from the crater floor up and over the walls, and then down the outer flanks of the cone.

Photo by Bill Rose, 1978 (Michigan Technological University).

This image is made available under the Creative Commons BY-NC-ND 4.0 license terms.

Keywords: outcrop | geology | stratigraphy | tuff | maar | crater

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