Uplift at Alid has exposed thick sequences of reddish, well-stratified siltstone beds, some very fossiliferous, which accumulated in a tidal or inter-tidal environment. High in the sequence there are some pillow basalts. At the very top of the sequence on the left is a few-meters-thick cover of light-colored rhyolitic Plinian pumice fallout.

Photo by Wendell Duffield, 1996 (U.S. Geological Survey).

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

Galleries: Volcanic Outcrops

Keywords: outcrop | stratigraphy | geology

Alid