Ash-flow tuffs and cauldrons in the northeast Mogollon-Datil volcanic field--A summary
— Glenn R. Osburn and Charles E. Chapin

Eight regionally significant ash-flow tuffs are known in the northeast part of the Mogollon-Datil volcanic field (fig. 1). Each is sufficiently distinct petrographically and stratigraphically to suggest that it formed from a discrete eruptive episode. Most of the tuffs are of large volume (>100 lcm3) which implies cauldron collapse in their respective source areas during eruption. Of these eight tuffs, cauldrons are known in detail for two, known from reconnaissance for one, and a general area is suspected, but not proven, to contain cauldrons for two more. The general stratigraphic relationships of these ash-flow tuffs are described in Osburn and Chapin (1983). This paper will summarize two additional aspects of the ash-flow tuffs: (1) the petrologic characteristics which allow these tuffs to be definitively correlated from range to range, and (2) the known or hypothesized source cauldrons.