Question

Age of fossils in the past was generally determined by radiocarbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms includes

• A. Study of the conditions of fossilization
• B. Electron spin resonance (ESR) and fossil DNA
• C. Study of carbohydrates/proteins in rocks
• D. Study of carbohydrates/proteins in fossils

Answer 1

The correct option is B Electron spin resonance (ESR) and fossil DNA

Electron spin resonance (ESR) and fossil DNA are more precise methods which are recently used to determine the age of fossils. And the results from these studies have led to the revision of evolutionary periods for different groups of organisms. ESR dating is used instead of Radiocarbon dating because ESR dating can date newly formed materials or previously heated rock.