Redondo Peak is an example of the volcanic feature known as a resurgent dome. It was formed some time after the main caldera-forming eruptions of about 1.4 million and 1.1 million years ago, but it is not itself an eruptive feature. The summit of the mountain is composed of tuff ejected by the more recent caldera-forming eruption, rather than of subsequent volcanic ejecta. It is forested all the way to its summit. Controversy concerning logging practices on the mountain contributed pressure to create the Valles Caldera National Preserve, within which logging is restricted.