Civilized man was killed by a bullet from a pistol in the age of dinosaurs

Damn! I was hoping this was a real topic. My first question would be, "Where's the bullet?" My second question would be, "How do you know it came from a pistol?"

My question was, "How do you know it as a pistol shot without the bullet? And how would you distiguish the entry/exit wounds of a bullet from, say, an arrow?

As far as I know, forensic experts can only estimate the caliber of a bullet that caused a wound yesterday. A hole in an ancient fossilized skull would be eroded, etc. so that even an estimate would probably not be possible. As for identifying "species" of firearm, you need something like a bullet or a cartridge casing. A hole just doen't give enough information.