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A twice-glaciated rock collected from a gravel quarry in western Pennsylvania. Callan Bentley has a blog post about this very cobble here: blogs.agu.org/mountainbeltway/2011/03/29/tillite-in-outwash /
This is a closer view of the roadcut seen in another currently uploading GigaPan. Despite the evident crystal blue sky, the day I shot this was, in fact partly cloudy. By the time I got down to Edi the clouds rolled in for good and I had no choice but to shoot the remainder of the GigaPan with different exposure se...
This is definitely not the most impressive roadcut of Gowganda Fm. tillite north of Elliot Lake, Ontario, however due to highway construction on the day I passed thru it was the most impressive one that I had access to for GigaPanning purposes.