Final answer:
Radiocarbon dating, also known as carbon-14 dating, is the most common absolute dating technique used on sites dating less than 70,000 years ago. It relies on the decay of the radioactive isotope carbon-14 to estimate the age of organic materials.
Step-by-step explanation:
The most common absolute/chronometric dating technique used on sites dating less than 70,000 years ago is radiocarbon dating, also known as carbon-14 dating. This method relies on the radioactive isotope carbon-14, which decays at a known rate. By measuring the amount of residual carbon-14 in organic materials, archaeologists can estimate the age of the artifacts within a margin of error of 50 years.