What caused this ravine?

2010 07 08 c 020ed

While this ravine looks natural and much like others in the area, it’s origin was not from natural causes.

Here’s a view from higher up on the hill:

2010 07 08 c 019ed

The first picture was taken from the bridge, looking up hill.

What caused this ravine?

See answer at An answer to a previous post

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