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Cyles, cycles, cycles. With regard to possible climatic cycles in the 6.5 Ma, 13 Ma, and 26 Ma frequency range, check out the following two publications: Bayer, U. & McGhee, G. 1986. Cyclic patterns in the Paleozoic and Mesozoic: implications for time scale calibrations. Paleoceanography 1:383-402. Bayer, U. & McGhee, G. 1989. Periodicity of Devonian sedimentary and biological perturbations: implications for the Devonian timescale. Neues Jahrbuch fuer Geologie und Palaeontologie Monatshefte 1989(1): 1-16. Enjoy! G. R. McGhee Fax: 908 445 3374 Internet: mcghee@gandalf.rutgers.edu
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