In Figure 13.3 we illustrate the incision history of Kings River as deduced by dating of caves embedded in the valley walls. For the sample from Bats Cave which is shown as having been abandoned at 3.09 Ma, calculate the ratio of ²⁶Al/¹⁰Be that must have been documented in the cave sediment.

Figure 13.3

Transcribed Image Text:

(c) Elevation Above River (m) 400 300 200 100 (b) Elevation Above River Level (m) 0 PO 0 Elevation (km) L 352515 0.5 400 300 200 100 South Fork Kings River Canyon 0.5 10 15 Distance (km) Incision Rate (mm yr) Windy Cliff Cave Bear Cave 0 0.32 +/-0.08 Ma 1 5 0.21 0.023 0.15 mm yr 20 Bat Cave 3.09 +/-0.30 Ma 1.5 2 Burial age (Myr) N Cliff cave Modern river sediment -0.06+/-0.10 Ma Boyden Cave .40 +/-0.08 Ma 0.02 mm yr 2.5 0.2 mm yr 3 3.5