The original carbon dates from McBurney's excavation were obtained from samples of wood charcoal and bone fragments.[1] Many original samples from McBurney's excavation and material from the most recent excavations were evaluated and confirmed by using several recent dating techniques during the CPP.[1] The first and earliest phase had the flake and blade artifacts which date back to 80 to 65,000 years ago (80-65 kya).[1] The second phase from 19 to 28 feet deep[2] contained the Levalloiso-Mousterian flints dated from 65 to 40 kya[1] with current dating techniques suggest these finds are closely dated from 73 to 43 kya.[1] At the depth of 23 feet [3] a modern human mandible was discovered which date between 73 and 65 kya.[1] Abundant evidence of the Levalloiso-Mousterian blade industry is found during the second stage of climactic change shows that there is no established tradition in blade making among these people during this time.[3] There were small hearths, food and bone accumulations also found in this phase.[3]