(U-Th)/He zircon and archaeological ages for a late prehistoric eruption in the Salton Trough (California, USA) Schmitt, A. K. ; Martin, A. ; Stockli, D. F. ; Farley, K. A. ; Lovera, O. M. Abstract Publication: Geology Pub Date: January 2013 DOI: 10.1130/G33634.1 Bibcode: 2013Geo....41....7S