dating: Absolute Dating. The varved-clay method is used with reasonable precision on build up as much as 12,000 years old.

dating: Absolute Dating. The varved-clay method is used with reasonable precision on build up as much as 12,000 years old.

Absolute dating can be performed by using historic documents and through the analysis of biological and geological habits ensuing from yearly climatic variants, such as for instance tree bands (dendrochronology) and varve analysis. Since 1950 the real sciences contributed lots of absolute dating techniques that have experienced an effect that is revolutionary archaeology and geology. These practices are in relation to the dimension of radioactive procedures (radiocarbon; potassium-argon, uranium-lead, uranium-thorium, thorium-lead, etc.; fission track; thermoluminescence; optically stimulated luminescence; and electron-spin resonance), chemical procedures (amino-acid racemization and obsidian hydration), in addition to magnetic properties of igneous product, cooked clay, and sedimentary deposits (paleomagnetism). ادامه مطلب …