This is a stretch of trail where half the width of the trail tread (the uphill part) is dug out of the original hillside and the outside half of the trail tread is created with the excavated material, which then gets compacted to make it walkable. (And safe, mostly.)
The finished trail tread is part original hillside and part fill, doncha see. This is a way of creating trail tread consisting of equal parts dirt and good intentions. Hard to get right. But then there are sometimes big immovable objects in the way, so what else can you do?
A half bench trail is built half on firm old ground and half on new packed fill, and is a good fit for half-fast hikers.
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Me? Recently unearthed. Again.