The peridotites range in texture from fine-grained equigranular through porphyroclastic to protogranular. This is interpreted as stratification by depth, with the three textural groups found at , , and over , respectively. The more fine-grained peridotites are also more fertile, and some approximate the model composition for primitive mantle. Clinopyroxenite is found as veins or dikes, particularly within the more fine-grained peridotite. Equilibration temperatures range from The xenoliths have P-wave velocities of 7.75 to 7.89 km/s, consistent with P-wave velocies in the Rio Grande rift of 7.6 to 7.8 km/s