Radiocarbon dating sphinx
This is calculated through careful measurement of the residual activity (per gram C) remaining in a sample whose age is Unknown, compared with the activity present in Modern and Background samples. Thus 1950, is year 0 BP by convention in radiocarbon dating and is deemed to be the 'present'.
You can get an idea of the relationship between C14 and age at the Carbon Dating calculator page. 1950 was chosen for no particular reason other than to honour the publication of the first radiocarbon dates calculated in December 1949 (Taylor, 19).
Erosion patterns from the Sphinx enclosure suggest a far older date than subscribed by Egyptologists and there are several at Giza discoveries from before the 4th dynasty that clearly suggest the complex was in use before the pyramids are said to have built.The first problem with Manetho's dynasties was that the Egyptians left few clues as to which dynasty followed which; they weren't interested in recording which dynasties ended in a revolution and which simply died out.More serious is that the original text of Manetho is no longer available; what we have are garbled editions quoted by two late Roman writers (Eusebius and Africanus), plus an excerpt from Josephus.Huge lever sockets are also visible in Menkaure’s quarry.The outer casing of the Great Pyramid was made from finer limestone and granite that were transported by boat via the Nile from Tura and Aswan, while the king’s chamber was made entirely from blocks of Aswan granite.