Raff southeast GSA Presentation March 2017

Page 1

Raff, J.L., Shawler, J.L., Ciarletta, D.J., Hein, E.A., and Hein, C. J.


Sediment Supply

Storms

Subtle Controls Mod. from Harris, 1992

Modified from Engelhart et al., 2012

Relative sea-level change


Deaton, Hein, and Kirwan, 2016


Western Ridge

Italian Ridge

Little Beach

Revels Island



Western Ridge 973 ± 144 CE

1000 – 1700 CE

Material for radiocarbon analysis…. Somewhere under that water 560 ± 60 years

Dr. Chris Hein (under blanket) Collecting OSL samples


Western Ridge 973 ± 144 CE

Little Beach 1761 ± 139 CE 1876 ± 20 CE

Revels Island 1456 ± 60 CE


Western Ridge 973 ± 144 CE

Little Beach 1761 ± 139 CE 1876 ± 20 CE

Revels Island 1456 ± 60 CE


Western Ridge 973 ± 144 CE Italian Ridge 1740 ± 20 CE

Little Beach 1761 ± 139 CE 1876 ± 20 CE

Revels Island 1456 ± 60 CE


Little Beach

1967

2016


Modified from Richardson, 2012




• Pleistocene highs stabilize and “pin” Holocene barriers • Abundant sediment supply (?) allows the barrier to prograde; young barrier • Recent (last 200 years) shift to a parallel erosional regime


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