Mystery Rocks in a Hollow Oak: Spring, Time, and Tree Growth

Cutting down a large red oak revealed rocks in its hollow center—and fresh water. How did they get there? The leading theory: a spring once bubbled at that spot. A century ago, someone ringed it with rocks to keep the water clear. An acorn sprouted, and as the oak grew, it engulfed the rock circle.

Alternative Theories

• Old well casing incorporated by the tree
• Ceremonial altar (less likely without evidence)
• Rocks dumped into a lightning strike cavity

A Reader's Insight

Randy S. notes that 1920s Atlanta property owners often placed rock circles around young trees. As trunks expanded, they swallowed the rings. This matches the "spring protection" idea—both involve rocks placed at ground level that trees eventually encompass.

The water suggests an active spring. If you're curious, a time machine would help. Short of that, enjoy the mystery—and the photos.