It was 1984 and the Edgar Cayce Foundation, named for an early twentieth-century psychic who claimed that the Sphinx and Khufu's Great Pyramid were built in 10,500 B. Old friends and supporters of the deceased psychic had visited Giza in the early 1980s and several of them were willing to put their beliefs to the test by radiocarbon dating the Great Pyramid. and built the Giza Pyramids in a span of 85 years between 25 B. In spite of this discrepancy, the radiocarbon dates confirmed that the Great Pyramid belonged to the historical era studied by Egyptologists.Archaeologists believe it is the work of the Old Kingdom Dynasty 4 society that rose to prominence in the Nile Valley from ca. In dealing with the 374-year discrepancy, we had to consider the old wood problem.Alternatively, if our radiocarbon age estimations were in error for some reason, we had to assume that many other dates obtained from Egyptian materials were also suspect. Samples were also taken from our excavations at Giza where two largely intact bakeries were discovered in 1991.
Libby reasoned that since the half-life of C years, the Djoser sample’s C14 concentration should be about 50% of the concentration found in living wood (for further details, see Arnold and Libby, 1949). Subsequent work with radiocarbon testing raised questions about the fluctuation of atmospheric C14 over time. 2613-2181 BCE) is also known as the ' Age of the Pyramids' or ' Age of the Pyramid Builders' as it includes the great 4th Dynasty when King Sneferu perfected the art of pyramid building and the pyramids of Giza were constructed under the kings Khufu, Khafre, and Menkaure.The historical records of this period, the 4th-6th Dynasties of Egypt, are scarce and historians regard the history of the era as literally 'written in stone' and largely architectural in that it is through the monuments and their inscriptions that scholars have been able to construct a history.We wanted to use science to test the accepted historical dates of several Old Kingdom monuments.One radioactive, or unstable, carbon isotope is C14, which decays over time and therefore provides scientists with a kind of clock for measuring the age of organic material.