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Hypothesis: reduction in sediment supply - from the critical zone!

Hypothesis: reduction in sediment supply - from the critical zone!. What do we actually know about rates of incision?. A little, all from the gravel-strewn Surfaces of the western edge of the High Plains. Dating the pediment gravels. Riihimaki on Rocky Flats: 1-2 Ma

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Hypothesis: reduction in sediment supply - from the critical zone!

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  1. Hypothesis: reduction in sediment supply - from the critical zone!

  2. What do we actually know about rates of incision? A little, all from the gravel-strewn Surfaces of the western edge of the High Plains

  3. Dating the pediment gravels • Riihimaki on Rocky Flats: 1-2 Ma • Verdos surface south of Rocky Flats • Miriam Duhnforth’s results from Table Mt

  4. Constraints on the timing and rates of basin exhumation Boulder Surfaces tracking exhumation of the basin: Rocky flats, Verdos, Slocum, Louviers, Broadway Rocky Flats

  5. Pediment surfaces along the Front Range

  6. Table Mt

  7. 141 ka 169 ka

  8. Rocky Flats

  9. Oops!

  10. Raymo et al. abandonment Widening and Erasure of surfaces Lots of glaciers

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