The Tres Piedras Granite yielded dates of ~1.69-1.70 Ga. The granite is interpreted to have been syntectonically emplaced during D1, and therefore provides an upper bound for D1. A date of ~1.69 Ga is established for the weakly deformed Tusas Granite.

The S1 crosscutting nature of this granite provides additional evidence for a 1.69 Ga date for D1. This date suggests that D1 occurred just before the Mazatzal orogeny (Yavapai orogeny). An S1/S2 crosscutting dike of fine grained granite of unknown origin has yielded an age of 1.63 Ga, which establishes a lower age for D1 /D2 deformation. This constraint suggests that D2 occurred during the Mazatzal orogenic period. It is probable that D1 and D2 were a single progressive tectonic event and that these constraints really apply to the overall period rather than individual components of deformation. These data more importantly provides a refined younger 1.69 -Ga age constraint to the deposition of the Hondo group. The timing of D3 is poorly constrained in this study, however one date collected from a monazite grain from the central portion of the study area suggests that there was a thermal event around 1.49 Ga.