Kuehn, S.C. and Negrini, R. M., 2010, A 250 k.y. record of Cascade arc pyroclastic volcanism from late Pleistocene lacustrine sediments near Summer Lake, Oregon, USA. Geosphere, Vol. 6, No. 4 (August), Pages 397-429. DOI: 10.1130/GES00515.1 Supplemental Figures and Captions for Supplemental Tables Site F sandy bed J3 sandy bed K bed L sandy major unconformity bed K Site E unconformity sand bed L bed L sand major unconformity major unconformity bed O bed Q bed P bed N bed M Figure S1. Major unconformity at sites C, E, and F. White card in photos is 15 cm high. Yellow and black scale bar is marked in 10 cm intervals. Only beds visible in the photographs are labeled. 1
Site F bed R bed S bed T bed T1 sand sand minor unconformity? bed W bed R bed S Site E bed T bed T1 sandy minor unconformity? bed V minor unconformity? bed V bed W bed W bed Z Figure S2. Unconformity between beds T1 and U at sites C, E, and F. White card is 15 cm high. Yellow and black scale bar is marked in 10 cm intervals. Only beds visible in the photographs are labeled. 2
Site E bed J3 sand and granules bed K bed L possible unconformity sandy sand over carbonate unconformity major unconformity sand Site F bed J3 sand and granules possible unconformity sand over carbonate = unconformity at site E Figure S3. Unconformity that cuts deformed beds K and L at site E and probable unconformity below bed J3 at sites E and F. White card is marked in 1 cm intervals. 3
bed NN Figure S4. Tephra bed NN at site C. Scale is marked in 10 cm intervals. bed LL3? bed MM bed MM1 Figure S5. Tephra beds MM, MM1, and possible bed LL3 at site C. Scale is marked in 10 cm intervals. 4
bed LL2 Figure S6. Tephra bed LL2 at site C. Scale is labeled in 1 cm intervals. bed LL bed LL1 Figure S7. Tephra beds LL and LL1 at site C. White card in photos is 15 cm high. 5
laminated, redeposited tephra bed KK) (primary graded bed) bed KK1 Figure S8. Tephra beds KK and KK1 at site C. White card in photo is 15 cm high. Beds KK and KK1 are present at all three sites and are the lowermost two tephras in the site E exposure. KK, KK1, and the fine, laminated sediments above KK together form a distinctive and easily recognized set. SPG core A bed JJ1 bed JJ1 bed JJ1 Figure S9. Tephra bed JJ1 at site C and in the SPG-A core. Scales are labeled in 1 cm intervals. White card is 15 cm high. 6
bed II1 bed JJ bed JJ bed JJ bed JJ 0.2 bed JJ 0.4 Figure S10. Tephra beds JJ0.4 through II1 at site C. Scale is labeled in 1 cm intervals. 7
bed II Figure S11. Tephra bed II at site C. Scale is labeled in 1 cm intervals. bed HH Figure S12. Tephra bed HH at site C. Scale is labeled in 1 cm intervals. 8
bed EE1 bed EE2 bed GG bed FF bed EE2 bed FF bed GG Figure S13. Tephra beds EE1 through GG at site C. Scale is labeled in 1 cm intervals. 9
bed DD1 bed EE Figure S14. Tephra beds DD1 and EE at site C. Scale is labeled in 1 cm intervals. bed DD Figure S15. Tephra bed DD at site C. Scale is labeled in 1 cm intervals. 10
bed CC Figure S16. Tephra bed CC at site C. Scale is labeled in 1 cm intervals. Site E bed BB bed BB1 bed BB Figure S17. Tephra beds BB and BB1 at site C and BB at site E. Scale is labeled in 1 cm intervals. 11
Site E bed AA Figure S18. Tephra bed AA at site E. Scale is labeled in 1 cm intervals. carbonate bed Y bed X bed Z Figure S19. Tephra beds X, Y, and Z at site C. Scale is marked in 10 cm intervals. 12
sand sand bed W Figure S20. Tephra bed W at site C. Scale is marked in 10 cm intervals. carbonate bed U bed V Figure S21. Tephra beds U and V at site C. White card is 15 cm high and is labeled in 1 cm intervals. 13
Site F bed S bed T bed T0.5 bed T1 Figure S22. Tephra beds S through T1 at site F. S, T, and T1 form a recognizable set at all three sites. White card is 15 cm high and is labeled in 1 cm intervals. 14
Site F bed R bed R filled burrows bed R1 bed R1 bed R2 Site E bed R1 bed R1 bed R3 bed R2 bed R3 bed R2 ostracode sand ostracode sand Figure S23. Tephra beds R through R3 at sites C, E, and F. White card is 15 cm high and is labeled in 1 cm intervals. 15
Site F bed O bed P bed Q Figure S24. Tephra beds O, P, and Q at site F. Scale is labeled in 1 cm intervals. bed N2 bed N2 bed O Figure S25. Tephra bed N2 at site C. Scale is labeled in 1 cm intervals. 16
bed L1 ostracode sands over major unconformity Figure S26. Tephra bed L1 and unconformity at site C. Scale is labeled in 1 cm intervals. bed K bed L Figure S27. Tephra beds K and L at site C. Scale is marked in 10 cm intervals. 17
Site E bed J1 bed J1 bed J2 bed J2 bed J3 Figure S28. Tephra beds J1 through J3 at site E. White card in photo is 15 cm high. 18
bed I bed J Site E bed I1 bed I1 bed J bed J Figure S29. Tephra beds I, I1, and J at sites C and E. Yellow and black scale bar is marked in 10 cm intervals. White card is 15 cm high and is labeled in 1 cm intervals. 19
Site F bed 2 Figure S30. Tephra bed 2 at site F. Scale is labeled in 1 cm intervals. 20
bed 8 bed 4 bed 6 Site E bed 8 bed 6 bed 4 Site F Figure S31. Tephra beds 8, 6, 4, and H0.4. bed 8 White card in photo is 15 cm high and bed 4 bed 6 is labeled in 1 cm intervals. Beds 8, 6, 4, and 2 are among those found in both outcrop and the Wetland Levee core (Negrini et al., 2000). bed H0.4 21
additional eruption or redeposited tephra bed H0.2 Figure S32. Tephra bed H0.2 at site C. Scale is labeled in 1 cm intervals. 22
Site F bed 12 bed 12 bed H bed H bed H Figure S33. Tephra beds 12 and H. White card in upper photo is 15 cm high. Scale in lower photo is labeled in 1 cm intervals. 23
Site F bed 12 bed 12 bed 12 Figure S34. Tephra bed 12 at sites C and F. Scale in upper photo is labeled in 1 cm intervals. Scale in lower photos is marked in 10 cm and 1 cm intervals. 24
erosion sandy bed F sandy bed F sandy Site E bed F silt bed G Site F Figure S35. Tephra beds F, F1, and G. Scale in top and bottom photos is labeled in 1 cm intervals. Scale bed F silt bed F1 in middle photo is marked in 10 cm and 1 cm intervals. bed G 25
Site E bed D reworked tephra bed 18 bed E bed E1 bed E Figure S36. Tephra beds D, 18, E, and E1 at site E. Scale is labeled in 1 cm intervals. Note the cross-bedding in the reworked tephra at the top of bed 18. 26
Site E bed B bed C bed C bed C1 bed C1 bed C2 bed C2 bed D Figure S37. Tephra beds B, C, C1, C2, and D at site E. Scale is marked in 10 cm and 1 cm intervals. 27
Site E bed B bed A bed C bed B bed B1 bed B2 bed B1 bed C Figure S38. Tephra beds A, B, B1, B2, and C at the top of the section at site E. Scale is marked in 10 cm and 1 cm intervals. 28
Table S1 Tephrostratigraphy for site C Table S2 Tephrostratigraphy for site E Table S3 Tephrostratigraphy for site F Table S4. Complete microprobe data organized by bed and sample. Data points which appear as obvious outliers on bivariate plots are listed separately from the dominant population(s). Means calculated from multiple data points on a single shard are indicated in the far right column. Note also that the smaller data sets obtained for some samples may not fully capture the range of compositions present, especially for the more heterogeneous tephra beds. Together with limitations in the precision of EPMA data, this results in some variability in the range of values reported for individual samples. Mean values, which are based on a larger number of data points, tend to be less variable than compositional ranges. 29