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Dating methods include:
radiometric dating methods:
K-Ar potassium/argon
Rb-Sr rubidium/strontium
argon/argon
U-Th-Pburanium/thorium/lead
carbon-14 dating
other methods:
tree-ring
Issues with dating:
Atmospheric helium concentration is inconsistent with an evolutionary time scale. Helium produced as a result of radioactive decay of terrestrial uranium, thorium and the like corrently suggest an outer limit to Earth's planetary time scale of under 40,000 years.
Zircon crystals should have measurable differences in lead and helium content based on their location in the earth's crust if layers vary in age significantly. Actual measurements suggest a geological timespan of no more than 10,000 years.
Additionally, volcanic sediment quantities, gas seepage, continental erosion, and metal content of the oceans suggest a much shorter timescale than the 4.6 billion years required by current evolutionary theory.
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