1. Assigning absolute ages to rock units on Mars is much more problematic. 2. This is mainly because absolute age dating is not precise enough at present. 3. Several factors complicate simple correlation of obsidian hydration band thickness with absolute age . 4. Absolute ages determined by crater density should therefore be taken with some skepticism.5. The absolute age of each layer of sediment can be dated by radiocarbon methods. 6. In absolute age it covers the time span 33.75 to 32.5 million years BP. 7. Uranium-lead radiometric dating involves using Uranium-235 or Uranium-238 to date a substance's absolute age . 8. Dal Sasso & Maganuco have tried to determine the absolute age of the hatchling. 9. Absolute ages derived from crater frequency measurements are model-dependent.10. By using stratigraphic principles, absolute ages in geologic time.
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