There are three known chambers inside the Great Pyramid of Giza. The lowest chamber is cut into the bedrock upon which the pyramid was built and was unfinished. The so-called Queen's Chamber and King's Chamber are higher up within the pyramid structure.
Geologic Clock with events and periods - History of the Earth - Wikipedia, the free encyclopedia. The Hadean, Archean and Proterozoic are eons. The Paleozoic, Mesozoic and Cenozoic are the three eras of the Phanerozoic Eon.