The first Sumerian king Alulim , at Eridu , is described as reigning for 28, years, followed by several later kings of similar periods. In total these antediluvian kings ruled for , years from the time when "the kingship was lowered from heaven" to the time when "the flood" swept over the land. A layer of riverine sediments, radiocarbon dated to ca. Polychrome pottery from the Jemdet Nasr period — BC was discovered immediately below the Shuruppak flood stratum. The "flood" described in the Sumerian King List, is believed to have a historical basis, and has been dated BC.
Dating creation - Wikipedia
Radioactive decay[ edit ] Example of a radioactive decay chain from lead Pb to lead Pb. The final decay product, lead Pb , is stable and can no longer undergo spontaneous radioactive decay. All ordinary matter is made up of combinations of chemical elements , each with its own atomic number , indicating the number of protons in the atomic nucleus. Additionally, elements may exist in different isotopes , with each isotope of an element differing in the number of neutrons in the nucleus.