Accession 21672124 Supplementary_Information_Stevenson_etal_Text.pdf Mathematical equations, mathematical symbols used, references in supplementary information for Stevenson et al., in press American Journal of Science. Supplementary_Table_S1.csv Cation and anion concentration data for Nepali water samples from Kisakurek 2005 PhD thesis and Kisakurek etal., (2005) in Earth and Planetary Science Letters. Supplementary_Table_S2.csv Analyses of d88/86Sr in seawater samples as standards. Supplementary_Table_S3.csv Major element composition of acetic acid leaches of Nepali river bedload samples Table 1 Stevenson_etal.csv Locations, stable Sr, radiogenic Sr data for water samples, Table 2 Stevenson_etal.csv Locations, stable Sr, radiogenic Sr data for bedload samples and leaches, Table 3 Stevenson_etal.csv Calculation fractions of cations derived from silicate and carbonate sources in Marsyandi Tibetan Sedimentary Series catchment.