Non isotopic dating
For dating back to about 35,000 years, sediment layers are precise. Sediments include different types of pollen depending upon the season.
Results from different techniques, often measured in rival labs, continually confirm each other.There are three reasons why radiometric data is known to be accurate: 1.It depends upon radioactive decay, which is known to be extremely stable, not influenced my chemical processes, and which can be measured quite accurately.other isotope pairs cover intermediate time periods between the spans for carbon 14 and uranium.Some radiometric dating methods depend upon knowing the initial amount of the isotope subject to decay.Other methods do not require knowing the initial quantities.
For example, potassium decays into two different isotopes of argon having different half-lives.
Measuring the ratio of C14 to C12 and C13 therefore dates the organic matter for periods back to about eight half-lives of the isotope, 45,000 years.
After a long enough time the minority isotope is in an amount too small to be measured.
The actual accuracy of radiometric dating is about 2%, but there is no point in splitting hairs for this debate as to whether it is 2% or 3%.
An error of 90% would, for example, still disprove Young Earth Creationism.
C14 is continually being created and decaying, leading to an equilibrium state in the atmosphere.