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Figure 2.
Summary of precise U-Pb zircon ages for the Tuolumne Intrusive Suite divided between its western (left) and eastern (right) sides. Ages are plotted at their positions relative to the inner and outer contacts of a given unit. Our ages as of 2001 (white symbols) showed eastward/inward younging of the western side of the suite; we tested and confirmed this pattern in 2001 by dating samples from the eastern side. Ages determined in other labs since then (gray symbols) have also confirmed this pattern and the 10-m.y. age span. Symbol sizes roughly indicate precision of ages and placement within each unit. Ages in gray from summary in Paterson et al. (2016). JGP—Johnson granite porphyry.
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