Second-day road log from Los Alamos through Valles Caldera and return
— Jamie N. Gardner, Fraser Goff, and Margaret Ann Rogers

The second day of the field conference examines the heart of Valles caldera, the world's type resurgent caldera and host to a classic liquid-dominated geothermal system. Our route will take us from Los Alamos through the pre-caldera volcanic highland of the Sierra de los Valles to the northeast edge of the Valle Grande (Stop 1). This viewpoint allows us to summarize basic information on the caldera and a chance to peer at a post-Valles moat rhyolite. From there we will drive north into Valle Toledo to view the Toledo embayment (Stop 2) and discuss the geology of the northern caldera wall. We continue west into Valle San Antonio to examine hydromagmatic deposits at Warm Springs dome, an eruptive remnant of the Toledo ring-fracture (Stop 3). Farther west, we will look at relatively unstudied, intracaldera lacustrine deposits that are so widespread in Valle San Antonio (Stop 4). Next we head south between Cerro Seco and San Antonio Mountain moat rhyolites to Alamo Canyon bog on the west side of Redondo border (Stop 5). This site gives us our first glimpse of hydrothermal features and the complexity of resurgent dome geology. From this site, we drive south to Sulphur Springs (Stop 6) where we can examine in detail acid hot springs and fumaroles and discuss subsurface geology. We finish the day with a drive into Redondo Creek to examine the geology of the keystone graben of the resurgent dome (Stop 7). We thank Heddy Dunn and Georgia Strickfaden of the Los Alamos Historical Society for some of the comments provided for the first 14 mi of the road log