Arizona geochronological sample: FX-137

Geochronologic sample location with analysis. Results summary: AA sani-sg:20.54+/-0.16; Location: Arizona, Goldfield Mountains (quad sheet APACHE JUNCTION); Citation: McIntosh and Ferguson, 1998; Sample description: Thin (< 1 meter-thick) nonwelded, crystal-poor, rhyolite tuff interbedded with conglomerate in a moderately (25-35o) north-dipping sequence which underlies the volcanic rocks at Pass Mountain. Mapped as Tst (Skotnicki and Ferguson, 1996)