Radiometric dating questions and answers
Paleozoic means ancient life, Mesozoic means middle life and Cenozoic refers to the time of recent life.
All of these dating methods begin with some radioactive isotope such as U-238, U-235, Th-232, K-40, or Rb-87. These elements are naturally radioactive, that is, they spontaneously emit an alpha or a beta particle and, as a result, are transformed into some different element, called the “daughter” isotopes.
Each period represents a change in the plants and animals at that time 5.
What do the terms Paleozoic, Mesozoic and Cenozoic mean?
Errors are particularly bad with the K-Ar (potassium-argon) method. Joan Engels wrote: It is now well known that K-Ar ages obtained from different minerals in a single rock may be strikingly discordant.3 Skull 1470 In 1972 Richard Leakey found a skull, near Lake Rudolf in Kenya, that he said was “virtually indistinguishable” from that of a modern human.
Studies have been made of submarine basalt rocks of known recent age near Hawaii. Yet it was found beneath a layer of the volcanic KBS Tuff that had an accepted radiometric date of 2.6 MY (millions of years old).