One use of the design was in the extraction of pine tar from pine roots and rich sapwood. In order to accomplish that a metal pot was filled with the pine wood and upended over the petroglyph which left only the channel to the edge of the rock exposed. This channel was covered by a piece of sheet metal when possible. Any gap around the rim of the pot was then sealed with clay or mud, and a fire was built around and on top of the pot. Heat from this fire would distill the pine tar from the wood which would drip down and be caught in the channels in the rock, to run out the channel to the edge of the rock and drip down into a second container as seen below.