Help with the archaeologists quest in fable 2?

I'm up to the 10th artifact which the note says is located in oakvale. I know that means wraithmarsh, but when I go my dog isn't picking up on the scent and finding a dig spot. I've gone all over wraithmarsh...and I got so fed up that I google searched it. Even walk throughs just say it's in "wraithmarsh". That doesn't help. I know it's in wraithmarsh. Can someone tell me specifically where it is IN wraithmarsh?