[Eva]

We have one that my daughter found that looks like a petrified hot dog. It is perfectly smooth, cylindrical, with rounded ends, black stone, but unusually light weight. The only thing that we can figure is that it was some kind of sharpening stone or flint for starting fires.

[blam]

"We have one that my daughter found that looks like a petrified hot dog. It is perfectly smooth, cylindrical, with rounded ends, black stone, but unusually light weight."

A petrified corpolite (turd) perhaps?