Needs review
Source: Races of Stone

Description: You can throw rocks just like a giant can

Prerequisites: STR 19, Size Large or larger

Required for: Fling Ally, Fling Enemy, Improved Rock Hurling

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.