When lava flows through forested areas, you sometimes find holes like this:
Hawai'i Volcanoes National Park
4 November 2006
1/180 @f/6.7; Pentax *ist DS; zoom lens at 18mm
When the lava hits trees, it begins to cool and harden almost immediately. The trees burn, but this can take a while, even in the middle of a lava flow. The end result is seen in the picture above - a tree shaped hole, known as a tree mold, that preserves the shape and occasionally even the surface texture of the tree.