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PDF File Paleontology Appendix J: Fossil Yield Potential Classification . Introduction This is a planning tool wherein geological units, usually at the formation or membe r level, are classified according to the probability of yielding paleontological resour ces that are of concern to land managers. Existing statutes and policies regulate the collec tion and disposition of scientifically significant fossils, but do not impact the recreati onal use of common variety fossils.