National Geochronological Database sample #15902

Outcrop or artificial surface exposure, Rhyolite

Geographic location
-109.281944, 32.776667
109° 16' 55" W, 32° 46' 36" N
Graham county, AZ
Guthrie 1:62,500 scale map quadrangle
Accurate to within 1 minute (~1 mile)
SW1/4 SEC. 33, T7S, R30E
Source of sample Outcrop or artificial surface exposure
Rock name Rhyolite
Description RHYOLITE FLOW, ERUPTIVE CENTER OF ASH PEAK-RHYOLITE PEAK
Laboratories University of Arizona
Compiler name Hansen, J.K.
Date compiled 1985 07
Precision of location Accurate to within 1 minute (~1 mile)
Location comment SW1/4 SEC. 33, T7S, R30E
Bibliographic reference Richter, D.H., Houser, B.B., and Damon, P.E., 1983, Geologic Map Of The Guthrie Quadrangle, Graham and Greenlee Counties, Arizona: U.S. Geological Survey Miscellaneous Investigations Series Map I-1455.
(click for info)
Geologic map unit -109.281944, 32.776667
Nearby scientific data Find additional scientific data near this location

K-Ar age determinations

Age estimate 23.1 ± 0.5Ma
age of volcanism
Type of analysis conventional K-Ar
NO ANALYTICAL DATA GIVEN
Rock or mineral analyzed biotite
Analytical details
Lab sample ID I
Decay constants 4.962E-04, 0.581E-04, 1.1167E-04
Comments BIOTITE AND SANIDINE GAVE CONCORDANT AGES.