Ages for Pyrite at Las Guijas Mine Group (Immense Lode; Grand Lode; General Electric Mine; General Electric Group Of Claims; Obregon Claims; Black Gold Group), Las Guijas Mts, Arivaca District (Las Guijas District), Las Guijas & San Luis Mts, Pima Co., Arizona, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 70Ma - 67.2Ma at this locality