Cinder Cone silhouettes. From left to right: Michelle Muth (Ph.D. student, University of Oregon), Sophie Leiter (undergraduate student, Middlebury College), and Andrew Hollyday (undergraduate student, Middlebury College) take a break from sample collection to explore the youngest cinder cone in the Cascades, Cinder Cone, as the sun begins to set behind Lassen Peak, Lassen NP, northern California. The mafic tephra collected on this field excursion in July, 2017, is being utilized for graduate and undergraduate research aimed at understanding mantle oxidization, sulfur recycling, and mafic magma storage in the southern Cascade Arc (a GeoPRISMS focus site!). Photo credit: Kristina Walowski