Alternative B would be the most effective for protecting the paleontological and geological values of concern in the McCullough Peaks South Paleontological Area. Alternative B also would result in the greatest restrictions on mineral development, ROW authorizations and other surface-disturbing activities; motorized travel; livestock grazing; and the excavation of paleontological resources. Alternatives A and C would allow mineral development, would open more routes to motorized travel, and would be less restrictive to the authorization of ROWs and surface disturbance in the area. Alternative A would be the least restrictive for oil and gas development and ROW authorizations, and may therefore result in the greatest potential for adverse impacts to the values of concern from surface disturbance due to these threats. A portion of the McCullough Peaks South Paleontological Area is included in the PETM ACEC under Alternative D; the Paleocene-Eocene Thermal Maximum section describes management of and impacts to this area.