『Abstract
　In situ produced cosmogenic ³He analyses provide independent support for the model of a stable, hyper-arid polar climate persisting in East Antarctica since the mid-Miocene and provide quantitative constraints on long-term rates of erosion within the Dry Valleys. In the Coombs Hills area, a series of cobble-size boulders from mega-ripples with wavelengths of approximately 50 m. Their topographic position and association with features characteristic of scabland, such as stripped, corrugated bedrock surfaces, indicate the boulders were deposited by subglacial floodwaters. Such outburst flooding could only have occurred during overriding of the northern Dry Valleys by a greatly expanded East Antarctic ice sheet. Timing of the overriding episode has been previously assigned to 14.8 to 13.6 Ma by correlation with volcanic ash deposits dated by ⁴⁰Ar/³⁹Ar in the Asgard Range of the Dry Valleys. Cosmogenic ³He concentrations in clinopyroxene from Ferrar dolerite boulders are consistent with 8.6 to 10.4 Ma exposure, calculated using scaling factors appropriate for Antarctica and assuming zero erosion. These are among the oldest surface exposure dates yet measured on Earth, but are not however consistent with the ⁴⁰Ar/³⁹Ar chronology used to define the age of the landscape due to unconstrained levels of erosion. Erosion rates of 0.03-0.06 m Ma^-1 are necessary to have produced the measured boulder exposure age if they were deposited at 14.8 Ma. These are less than half the steady-state erosion rate derived from cosmogenic ³He in the nearby bedrock surfaces (0.17 m Ma^-1) and testify to the extreme stability of the landscape.

Keywords: stable cosmogenic isotopes ³He; exposure age; erosion rates; paleoclimatology; landscape evolution; Dry Valleys』

1. Introduction
2. In situ cosmogenic isotope studies i the Dry Valleys
3. Sample description
4. Analytical method
5. Results
6. Interpretation of the cosmogenic ³He data
7. Conclusions
Acknowledgements
References