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What causes this striped rock formation?

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What causes this rock formation?

I was hiking a very popular trail in Akamina-Kishnena Provincial Park, and noticed these strange lines in the rocks on top of the mountain:

enter image description here

The lines were parallel to each other, and were on both sides of the trail covering quite a large area of the mountain face. My best guess is that run off from snow melt could cause this, but they look almost like they were raked. The picture was take at around 2,400m in elevation. What causes this?

This is the ridge we were on:

enter image description here

The lines were on the southern face of the mountain.