title: Planetary science: Volcanism or aqueous alteration on Mars?
authors.affiliation: Department of Geological Sciences, Arizona State University, Tempe, Arizona 85287-6305, USA. hamilton@higp.hawaii.edu
authors.forename: Victoria E
authors.initials: VE
authors.lastname: Hamilton
authors.forename: Philip R
authors.initials: PR
authors.lastname: Christensen
authors.forename: Joshua L
authors.initials: JL
authors.lastname: Bandfield