Figure 51. Large-scale geologic map of Barrel Spring area showing USGS and other paleobotany localities discussed in text. Dinosaur-bone localities also shown and geochemistry of bone samples from lettered localities shown on Table 2 and Table 3. Geology modified from Brown (1982); base of Ojo Alamo remapped by author for this study. All of area, except south of San Juan County Road 7500, in Bisti - De-na-zin Wilderness Area.