Day #73 Outcrop: Glacial Striations on Slate

Today’s outcrop takes us to Vermont for a look at some glacial striations on slate. This exposure is indeed a natural outcrop, though it sits at the rim of a slate quarry. I feel confident in identifying these as striations rather than tool marks of quarry equipment because they have an appropriate north-south alignment and the entire surface of the outcrop has a glacial polish. In the foreground of the first image below, you can see a bit of the slate’s cleavage dipping steeply to the right.

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Glacial Striations on Slate

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Follow the Striation

The area around Castleton and Poultney, Vermont was the final field mapping project area for Colgate’s Geology Summer Field Camp (The “OC”) when I was an undergrad there. As you can see from the quarry “tailings” pile below, there are no lack of samples to collect in this region. I’ve assembled a group of them for this week’s deskcrops, so if you enjoy slate stay tuned…

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Slate “Tailings”

Explore this and all of my 2010 Deskcrops and Outcrops in Google Earth!

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