Solari and Schaaf (2006) criticize data and interpretations presented in a recently published paper aimed at better understanding of the basement geologic history of the Xolapa Complex (Ducea et al., 2004). The data presented in Ducea et al. (2004) are zircon U-Pb ages used to address some of the important questions surrounding the rather poorly understood Xolapa Complex (DeCserna, 1965), also referred to as the Xolapa or Chatino terrane (Campa and Coney, 1983; Sedlock et al., 1993), such as (1) what is the age distribution of deformed versus undeformed plutonic rocks in the...

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