Geological Laws; Relative and Absolute Numerical Dating
Geologists collect paleomagnetic samples by drilling and removing a core from bedrock, a lava flow, or lake and ocean bottom sediments. The Limitations of Paleomagnetic and Archaeomagnetic Dating Using this technique, a core or sample can be directly dated. However, sometimes the error associated with K-Ar date is greater than the time span being studied using Paleomagnetic or Archaeomagmetic Dating techniques.
Fourth, paleomagnetic dating can only date deposits that are hundreds of thousands to millions of years old.