Types of uranium dating
To me it has been a real eye opener to see all the processes that are taking place and their potential influence on radiometric dating.
When an organism, eg a tree, dies it stops taking in carbon dioxide.
The amount of carbon-14 in the wood decreases with time as it decays into nitrogen with a half-life of about 5700 years.
There are a number of implausible assumptions involved in radiometric dating with respect to long time periods.
One key assumption is that the initial quantity of the parent element can be determined.
U at the time of sample formation must be known or calculated.