GL-3. Areas will be classified according to their potential to contain vertebrate fossils or noteworthy occurrences of invertebrate or plant fossils. Paleontological Sensitivity Classes are as follows.
Class 1 (low sensitivity): Igneous and metamorphic geologic units and sedimentary geologic units where vertebrate fossils or uncommon invertebrate fossils are unlikely to occur.
Class 2 (moderate sensitivity): Sedimentary geologic units that are known to contain or have unknown potential to contain fossils that vary in significance, abundance, and predictable occurrence.
Class 3 (moderate sensitivity): Areas where geologic units are known to contain fossils but have little or no risk of human-caused adverse impacts or low risk of natural degradation.
Class 4 (high sensitivity): Areas where geologic units regularly and predictably contain vertebrate fossils or uncommon invertebrate fossils and are at risk of natural degradation or human-caused adverse impacts.