Strange Boulder Markings on Rattlesnake Trail?

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By an edhat reader:

I was hiking rattlesnake trail the other day and noticed these strange marks in this boulder that is in the area with the pools and running water.

What could have caused this?

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pstarSR Nov 13, 2018 05:13 PM
Strange Boulder Markings on Rattlesnake Trail?

there are alot of rocks with bore holes for blasting, and marks from being dragged by chains. those look like what everyone else is stating. saw used to create " traction" on the rock

a-1544544914 Nov 13, 2018 04:10 PM
Strange Boulder Markings on Rattlesnake Trail?

These cuts were man-made to create traction and prevent slip and falls off the slick rocks in the main part of the trail at the creek crossing.

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