Figure 8. One lesson learned from the pipeline exposures is that the glacial deposits are often much more complex than we would expect from looking at the ground surface. This photo shows a good example in Albany township. Walking across this area before the pipeline was built, boulders on the ground surface might have suggested the presence of glacial till, but few other details could have been seen in the wooded terrain. However, the trench shows abrupt transitions from bedrock (foreground) to glacial sand midway up the hill, and then to glacial till on the hilltop. This is just the opposite of the "normal" case, where bedrock outcrops on hills but is buried by glacial sediments in low areas!

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Last updated on October 6, 2005

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