FIGURE 1.  Northeast-trending geophysical-log cross section across San Juan Basin showing variability of Ojo Alamo Sandstone in subsurface of San Juan Basin. Geophysical log traces of Ojo Alamo from stratigraphic cross section A-A' of Fassett (2000, Plate 1). Shaded areas inside log traces are sandstone, white areas represent mudstone interbeds; lithologies are based on geophysical log interpretation by the author. Bone symbol on log 1 indicates level of multiple-bone set; the "articulated" bones of Lucas et al. (2009). Modified from figure 5 of Fassett et al. (2002).