I first read about on this forum and I had never heard of it either - don't think anyone in this area has ever heard of it since I have ask everywhere I know to ask. It is a kind of mulch, mixed with sawdust in some cases, that is an excellent cover for muddy areas. This ice has left us with some really muddy areas and with spring rains coming I thought it would be just the thing. But the only thing I can find online is in the Washington State and Oregon area so I guess a by product of the logging market.
I'm looking for anything not is not terribly expensive to put in the front of our big horse paddocks where they congregate and it stays muddy.