Quaternary Research Center, Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195-1310, USA; Astrobiology Program, University of Washington, Seattle, WA 98195-1310, USA
Quaternary Research Center, Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195-1310, USA; Astrobiology Program, University of Washington, Seattle, WA 98195-1310, USA
Quaternary Research Center, Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195-1310, USA; Astrobiology Program, University of Washington, Seattle, WA 98195-1310, USA
Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78713-8924, USA
Quaternary Research Center, Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195-1310, USA; Astrobiology Program, University of Washington, Seattle, WA 98195-1310, USA
Quaternary Research Center, Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195-1310, USA