Fig. 3. Periods of extremely low in precipitation in the Mimbres region. The tree-ring precipitation reconstruction was developed by Grissino-Mayer et al. (1997), with funding from the Legacy Program, Directorate of the Environment, Natural Resources Division, Fort Bliss, Texas. Periods of extremely low precipitation were identified by Ingram (unpublished manuscript) using a nine-year interval running average throughout the duration of the tree-ring precipitation reconstruction (i.e., AD 622–1994). Extreme lows were defined as those intervals in the lowest quartile and decile of the distribution of all nine-year intervals in the reconstruction.