Which of the following is not a chronometric dating method
Following death, however, no new carbon is consumed.
Progressively through time, the carbon-14 atoms decay and once again become nitrogen-14.
However, paleoanthropologists rarely use it to date sites more than several million years old.
rock, soil, and clay produce constant low amounts of background ionizing radiation.
By cross-linking core samples from living and dead trees, a master sequence of annual tree-ring widths can be compiled.
Such contamination can occur if a sample is exposed to carbon compounds in exhaust gasses produced by.
In addition, any argon that existed prior to the last time the rock was molten will have been driven off by the intense heat.
As a result, all of the argon-40 in a volcanic rock sample is assumed to date from that time.
When a fossil is sandwiched between two such volcanic deposits, their potassium-argon dates provide a minimum and maximum age.