Geochronologic sample location with analysis. Results summary: KA-biot:19.5+/-0.4; Location: Tuff is deposited on basal conglomerate overlying Precambrian Oracle granite. Lat, long more likely 33 01'37'', 111 11' 34''; this puts location on tuff outcrop next to road.. Collected by: W. Rehrig/CONOCO Minerals Arizona, Donnelly Wash area (quad sheet NORTH BUTTE); Citation: Damon et al., 1996; AZGS OFR 96-18; Sample description: Crystal welded tuff, dacitic (?) compostion. Sample represents the first tuffaceous volcanism of intermediate compostion in the Superior-Ray Region
Summary
Geochronologic sample location with analysis. Results summary: KA-biot:19.5+/-0.4; Location: Tuff is deposited on basal conglomerate overlying Precambrian Oracle granite. Lat, long more likely 33 01'37'', 111 11' 34''; this puts location on tuff outcrop next to road.. Collected by: W. Rehrig/CONOCO Minerals Arizona, Donnelly Wash area (quad sheet NORTH BUTTE); Citation: Damon et al., 1996; AZGS OFR 96-18; Sample description: Crystal welded tuff, dacitic (?) compostion. Sample represents the first tuffaceous volcanism of intermediate compostion in the Superior-Ray Region