Figure 5. This plot shows cosmogenic exposure ages from a fjord landscape. Erratic samples (circles), from all elevations (including high elevations) yield relatively young ages. This suggests that even the highest locations on the landscape were covered by ice ~10,000 to 25,000 years ago - during the last glaciation. Interestingly, highly weathered bedrock (black squares) yields relatively old exposure ages, no matter what elevation the bedrock is from. Together with the erratic samples, these weathered bedrock ages suggests that despite ice covering the landscapes that contain weathered bedrock, the bedrock was not eroded. Finally, glacially eroded bedrock (black diamonds) only yields relatively young ages, indicating that it was carved by ice ~10,000 to 25,000 years ago - during the last glaciation. Combined, the data support the Jakobshavn model of fjord glaciation. From Briner et al. (2006).
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