I am looking for anything in the Pathfinder rulebooks that states the relationship between an objects weight and the damage that it would cause if used as a weapon, similar to D&D 3.5 Complete Warrior chart for improvised weapons, or dropped on a monster.
ex. Using the D&D 3.5 Complete Warrior chart for improvised weapons; if my 1st level wizard, using Summon Monster I, summons a pony which weighs 600 lbs and has it appear 20 feet above the monster and it drops, does it do 6d6 damage from its weight and an additional 2d6 because of the falling damage caused to the pony and the monster?