1. Post-LGM evolution of Reedy Glacier, Antarctica,
as an indicator of current ice sheet stability
Gordon Bromley, Brenda Hall, Claire Todd, John Stone,
Howard Conway, Maurice Conway
R O S S
S E A

2. ROSS SEA Hatherton Glacier c. 6800 yr BP McMurdo Sound c. 7400 yr BP
W A I S
E A I S
Roosevelt Island
c yr BP
Hatherton Glacier
c yr BP
McMurdo Sound
c yr BP
ROSS SEA
Terra Nova Bay
c yr BP

3. Reedy Glacier, 86˚S ROSS SEA Hatherton Glacier c. 6800 yr BP
W A I S
E A I S
Roosevelt Island
c yr BP
Hatherton Glacier
c yr BP
McMurdo Sound
c yr BP
ROSS SEA
Terra Nova Bay
c yr BP

4. EAIS WAIS Downglacier (north-west) from Quartz Hills, 85˚56’S
Watson Escarpment from Caloplaca Hills, 86˚07’S

5. Hypotheses
Stabilisation of Reedy Glacier during the Holocene suggests stability
of Ross Sea grounding line
2) Modern instability of Reedy Glacier suggests ongoing
recession of Ross Sea grounding line

6. E A I S Strickland Nunatak: 40 m Hatcher Bluff: 40 m
Metavolcanic Mtn: 40 m
Shapley Ridge: 40 m
Polygon Spur: m
Caloplaca Hills: 150 m
Quartz Hills: 300 m
Langford Peak: >110 m
Cohen Nunatak: >110 m

7. Reedy III drift (LGM) overlying old surface, Quartz Hills

8. Pre-LGM deposits, Quartz Hills
W A I S
Pre-LGM deposits, Quartz Hills

9. Surficial geology and geomorphology of Polygon Spur, Reedy Glacier

10. Surficial geology and
geomorphology of
Quartz Hills

11. Present and former surface profiles of Reedy Glacier

12. Glacial deposits have allowed reconstruction of Reedy Glacier at the LGM
WAIS was c. 600 m thicker at the LGM than at present