Data for 2228

Sample identification
Record ID 2228
Sample ID A33125
Geographic location
Quadrangle Petersburg
Latitude 56.509998
Longitude -132.053329
Processing information
Dating method K-Ar
Comment Rhyolite porphyry, questionable age calculation
Reference Douglass et al, 1989
Sample characteristics
Rock type porphyry
Mineral dated muscovite
Analytic result
Age (my) 15