It's Lorna's Laces Shepard Sock in the Mtn Creek colorway. I love this yarn and I actually made myself a pair of socks already. But I have enough left over for footie or ankle socks. I wanted to do them toe up so I could tell when to stop the ribbing!
I ended up winding the yarn around two chairs, counting how many turns, and winding it into two separate, equal center pull balls. DH laughed at me! But I told him, hey, I was actually saving money by not having to buy MORE yarn. Here are the original socks made in that yarn.