Constraints on age, erosion, and uplift of Neogene glacial deposits in the Transantarctic Mountains determined from in situ cosmogenic (super 10) Be and (super 26) Al

(super 10) Be and (super 26) Al data from sandstone boulders in three Neogene glacial deposits in the McMurdo Sound-Dry Valleys region of southern Victoria Land, Antarctica, indicate minimum exposure ages of approximately 3 Ma and maximum long-term erosion rates of approximately 5-12 cm/my, supporting the suggestion that polar desert conditions have persisted in the Dry Valleys since at least late Pliocene time. Variation of cosmogenic nuclide production rate with altitude also allows constraints on past uplift rates. Model calculations employing (super 10) Be data indicate little or no uplift in the Dry Valleys region in the past 3 my, precluding rapid ( approximately 1 km/my) late Pliocene uplift previously suggested for some parts of the Transantarctic Mountains.