This is my favorite boulder at Hairpin, it has an very nice face with many options on it including a right to left traverse with a top out. The top of the rock is slightly polished so scope it out for good hand placement before you get started.
This boulder is sitting at the very bottom of the left hand wall (the first bolted sport routes on the left side of the canyon). You can be there in about 5 minutes from the car if you aren't poking around.
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Mountain Project's determination of some of the classic, most popular, highest rated routes for Marble Cake:
Chiuy Senter V1+ Boulder
Featured Route For Marble Cake