In the November issue of GSA Bulletin, Lewis et al. report on till stratigraphy constrained by Ar/Ar ages of volcanic ash from the Olympus Range in the Dry Valleys. According to the article till generated by wet-based glaciers is older than sublimation till from dry-based glaciers nearby. The ages on the ashes are used to determine the age of the transition.Read the abstract here...
Photo: Adam Lewis
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