Fig. 6: Climate, geomorphic activity, and clastic sediment fluxes into Stoneman Lake.
From: Higher interglacial dust fluxes relative to glacial periods in southwestern North American deserts
Note the change in the x-axis scale at 20 ka. Glacial-interglacial cycles numbered by Marine Isotope Stage (MIS) with strong glacials shaded blue and substages indicated by dashed lines. Substage boundaries during MIS 5 generally align with 20-kyr precession cycles. a Fine dust mass accumulation rate at Stoneman Lake, indicating emissions occurring 100’s of kilometers upwind across the Basin and Range province. b–d Indicators of hydroclimate in the Basin and Range province. b Water table height (inverted) at Devils Hole, Nevada67. c δ18O of cave wall calcite (inverted) at Devils Hole, Nevada46. d Percentages of warm-arid taxa from Bear Lake, Utah-Idaho47. e Coarse dust mass accumulation rate at Stoneman Lake, indicating emissions occurring 10’s of kilometers upwind in the Verde Valley. f Age ranges of fluvial and alluvial deposits in the Verde Valley54,55,56,57,58,59,60 (light gray, labeled by map unit name). New interpreted age ranges of fluvial (black) and alluvial (gray) units based on correlation to (e). g Fluvial aggradation episodes in the Colorado River system, including lower Colorado River deposits of the Chemehuevi Formation62, the Little Colorado River53, and in the Eastern Grand Canyon61. h Flux of local clastic material into Stoneman Lake representing trends across the northern and eastern uplands of the Verde Valley. i–k Climatic and paleoecologic indicators from STL14 core63. i Charcoal count indicating wildfire activity (large particles (60–100 µm) indicated by gray bars). j Tree taxa percentages reflecting local forest composition. k Principal component analysis of non-pollen palynomorphs. Higher nPC1 scores indicate oligotrophic conditions and a higher lake level. Error envelope of mass accumulation rates (a, e, h) based on percent error propagation of values factored into their calculation.
