Management under Alternative B would be the most effective for protecting the paleontological values of concern in the existing Brown/Howe Dinosaur Area ACEC and the proposed expansion area, but also would result in the greatest restrictions to the ROW authorizations and mineral development. Impacts under alternatives A, D, and C would be similar and would be less restrictive toward mineral resource development in the existing and expansion areas than under Alternative B. Management under alternatives A, D, and C would provide less protection for paleontological values compared to the expanded Brown/Howe Dinosaur Area ACEC under Alternative B.