SUPPLEMENTARY INFORMATION; Smith et al. (2008, Nature. Geoscience) NGS A

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1 SUPPLEMENTARY INFORMATION; Smith et al. (2008, Nature Geoscience) NGS A Supplementary Table 1 Geology of uplifts surrounding the Greater Green River Basin Uplift Exposed crystalline rock (km 2 ) Area weighted CIPW Norms* average Na 2 O% Or Ab+An Q References Gros Ventre Teton (n=19) ( 1-3 ) Wind River (n=67) ( 4-7 ) Granite Mountains (n=51) ( 7-10 ) Rawlins 56 n.d. - Sierra Madre-Park (n=26) ( ) Sawatch (n=2) ( 16,17 ) Laramie (n=80) ( ) Front Range (n=29) ( ) Medicine Bow (n=2) ( 12,14 ) Uinta 0 - ( 24,25 ) White River 0 - ( 26 ) Sevier fold thrust belt (n=1) ( ) Notes: n.d. indicates no data avail able. *Mineral volume proportions calculated from whol e rock chemistry. Presently exposed areas of Precambrian rocks were not unroofed in Early Eocene Supplementary Table 2 Composition and thicknesses of Eocene strata in the Greater Green River Basin Stratigraphic Unit References Wilkins Peak Member, Green River Formation ( ) Cathedral Bluffs Member, Wasatch Formation ( 9,31,34-40 ) Battle Springs Formation ( 8,9,41,42 )

2 Supplementary Table 3 Trona bed volume, Na mass, and age Bed # Volume (km 3 ) Na (t ) Interpolated Age (Ma) Notes: All values from Wiig et al. (1995) 43, except beds 13, 22, and 23, from Burnside and Culbertson (1979) 4 4. Trona density =

3 Supplementary Figure 1. Representation of multicomponent mixing model used to constrain the fraction Phanerozoic-derived alluvium (PhF). Denudation calculated for varying PhF values using two independent methods: D S equals the sum of E and W, whereas D Na is determined from Na flux W Na by assuming a regolith profile of constant thickness and Na depletion of CDF Na was continually advancing into fresh bedrock and eroded in a steady state fashion. CDF S and CDF D correspond to D S and D Na, respectively (cf. Table 1). The area of intersection between the uncertainty envelopes for each measure reflects the most internally consistent values amongst measured constraints.

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