Radiometric Age Determinations
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There have been only a few Radiometric Age Determinations done in the AFNM area.
Tertiary
Hickey Fm., Basalt (10.7 My, whole rock) east of Cordes Junction. (N34.16.7' & W112 2.36') Anderson & McKee #MY6
Hickey Fm., Basalt (15.39 My, whole rock) near hutch mesa. (N34 4.33' & W112 6.5')
Silver Creek Basalt (10.7 My, whole rock)
Joes Hill Volcano, Basaltic andesite, (Ar-Ar, 10.8 My, whole rock)(N34, 10', 51" & W112, 04', 44")
Squaw Creek Mesa, Basalt, (10.4 My, whole rock) (N34, 04', 12" & W112, 03', 34")
Proterozoic
Granodorite (1.72 Ga, plagioclase zircon) Agua Fria river, on monument. There seems to be some confusion on the Badger Spring Granodorite date, its listed by some authors as 1.72 and others as 1.74 Ga.
