You can throw rocks like a giant can.
Prerequisites: Str 19, size Large or larger (goliaths qualify by virtue of their powerful build racial trait).
Benefit: You can hurl rocks weighing 40 to 50 pounds (Small objects) with a range increment of 15 feet. The rocks deal 2d6 points of damage plus your Strength modifier. Rocks have a maximum range of five range increments.
Normal: As an improvised weapon, a 40- to 50-pound rock deals 2d6 points of damage with a range increment of 5 feet, and such a rock can be thrown only as a full-round action. A character without the Rock Hurling feat is considered to be nonproficient, taking a –4 penalty on the attack roll.
Source: Races of Stone, page 143.