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

1 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

2 Spring 2007 – CRONUS field expedition

3 3 3

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

5 5 5

6 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 7

8 Upper Terrace Lower Terrace 8

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

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

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

12 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 13

14 Comparison of Lal and Lifton scaling schemes
14

15 Comparison of calib sets
15

16 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

17 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

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

19 19 19

20 20 20

21 Whidbey Island, WA 21

22 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

23 Questions? 23

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