This dataset consists of measurements of cosmogenic 14C in quartz for cobbles collected from a series of nunataks (Turtle Rock, Notebook Cliffs, scoria cone) proximal to Mount Murphy, a volcanic edifice located between Pope and Thwaites glaciers, West Antarctica. The cobbles were collected during the 2015-2016 Antarctic field season. The dataset includes 13 cosmogenic nuclide surface exposure ages and all field (location, elevation, shielding, thickness) and analytical laboratory data required to calculate in situ 14C exposure ages. Analytical data includes quartz sample mass, total CO2 liberated from the sample, delta-13C, 14C/12C AMS ratios and 14C/12C AMS ratios of procedural blanks. Funding source: Natural Environment Research Council (NERC): Grants NE/S006710/1, NE/S006753/1 and NE/K012088/1 and National Science Foundation (NSF): Grant: OPP-1738989. The dataset is a component of the "Geological History Constraints" project of the NERC-NSF funded International Thwaites Glacier Collaboration (ITGC).

This dataset comprises 52 cosmogenic 10Be surface exposure ages and associated analytical data from quartz-bearing rocks from Mount Murphy and surrounding nunataks in Marie Byrd Land, Antarctica. The samples - glacial erratics and bedrock - were collected between 2006 and 2016 by Joanne Johnson, Stephen Roberts and James Smith (British Antarctic Survey), in order to determine timing and duration of ice sheet thinning in the Amundsen Sea sector of the West Antarctic Ice Sheet, specifically thinning of Pope Glacier. The data are published and interpreted in the following paper: Johnson, J.S., Roberts, S.J., Rood, D.H., Pollard, D., Schaefer, J.M., Whitehouse, P.L., Ireland, L.C., Lamp, J.L., in review. Deglaciation of Pope Glacier implies widespread early Holocene ice sheet thinning in the Amundsen Sea sector of Antarctica. Earth & Planetary Science Letters. doi: xxxxx This data forms part of the ANiSEED project ('Amundsen Sea Embayment Exposure Dating'), funded by the Natural Environment Research Council (grants NE/K012088/1 and NE/K011278/1).