You sit down on a an old rotten tree stump and see some sap in the middle. Jackpot. The core of that stump is likely saturated with sap - fatwood. A few kicks and grunts and you got the resin scented core out. Using axe and knife and after drying it up and you got a treasure for fire starters that will last you years.
This is the reason I kick old tree stumps when walking in the woods. A fatwood rich stump will feel more solid, almost rock hard. Putting your nose to the wood will reveal the treasure.