Post-glacial marine terraces on San Juan Island, Washington: A product of multiple Meltwater Pulses 1A Hope Sisley, Terry Swanson, John Stone University.

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Presentation transcript:

Post-glacial marine terraces on San Juan Island, Washington: A product of multiple Meltwater Pulses 1A Hope Sisley, Terry Swanson, John Stone University of Washington 1 1

Spring 2007 – CRONUS field expedition

3 3

LiDAR map of Cattle Point, showing sample locations Color LiDAR image of CPT LiDAR map of Cattle Point, showing sample locations

5 5

Why Cattle Point? Undisturbed – never burned, logged, or developed Good independent dating control Lots of quartz-rich boulders Low elevation and relief Simple exposure history 6 6

7

Upper Terrace Lower Terrace 8

1B 1A 9 9 ESL curve from Camoin et al. 2004 RSL curve from Mosher and Hewitt 2004 9 9

Updated Calibration of Local Sea Level Curve Shell recalibrated using Marine13 Peat recalibrated using Intcal13 (Both from Reimer et al. 2013)

Be-10 Dating Results Upper Terrace Lower Terrace Prior Exposure 11

Dates are clustered better than expected considering inherent error Upper and lower terraces each form a distinct clump of ages Figure made using Lal scaling scheme and Scot calib set 12 12

13 13

Comparison of Lal and Lifton scaling schemes 14

Comparison of calib sets 15

Relative air pressure at upper terrace, accounting for pressure change effects of world ice sheets Relative height of upper terrace above sea level Relative sea level (curve from Mosher and Hewitt) -> Effective base of atmosphere

Correction to Sample Raw Exposure Age Due to Isostatic Effects on Atmospheric Shielding Change in sample age due to isostatice effects (cal yr) Calendar Years Before Present

Isostatic-Effect-Corrected Sample Ages Current Height ASL (m) Be-10 Age (Cal Yr BP)

19 19

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Whidbey Island, WA 21

Many thanks to… The Mary Gates Foundation The National Science Foundation CRONUS Heather Rogers Maciej Sliwinski Tomasz Trzpil Joy Laydbak Lawrence Livermore National Laboratory …and everyone else who has helped! 22

Questions? 23