Paul R. Bierman, Alan R. Gillespie, Scott Kuehner; Precision of rock-varnish chemical analyses and cation-ratio ages. Geology ; 19 (2): 135–138. doi: https://doi.org/10.1130/0091-7613(1991)019<0135:PORVCA>2.3.CO;2
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New data and statistical analyses indicate that the precision of the mean rock-varnish cation ratio determined for a geomorphic surface and the uncertainty of the age calculated from that ratio are controlled by the area of varnish included in each chemical analysis, the precision with which each cation ratio is determined, and the number of independent chemical analyses. This study has implications for the interpretation of published cation-ratio ages and the future use of cation-ratio dating.