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2-foot 6-inch level 2,000 years younger 4-inch level Adena AGE DETERMINATION Alaska American Antevs appears archeological conceptions archeological evidence archeological reasoning archeological sites Archeologists artifacts atomic beach bottom level burned bone carbon 14 carbon-14 date carbon-14 tests cave containing Cave in Nevada Cave in Oregon charcoal charred Clovis Cochise contemporaneous cosmic rays Creek cultural material date was obtained deﬁnite deposits disintegration eastern United Egypt error estimated ﬁber ﬁelds ﬁgures ﬁll ﬁre pit ﬁrst announced ﬁve ﬂoor Folsom complex FRANK H. H. ROBERTS gave geologic glacial guano Gypsum Cave Hopewell horizon identiﬁed late later Libby Lindenmeier site lintel living matter Mankato Mesolithic METHOD OF AGE mound Mount Mazama Neolithic Newberry eruption occupation older oldest Palli Aike peat period Pleistocene pollen analysis pumice pumice Cressman radiocarbon dating samples sandals sequence shell signiﬁcance speciﬁc specimens stratigraphic Tierra del Fuego tion typological volcanic ash weir wood