Some hair and tissue remained attached to the skull, which workers found sitting on insulation in the otherwise empty attic at a home near 200 West and 100 South, said Tooele Police Chief Ronald Kirby. It appears to have been in the attic for "at least a number of decades," Kirby said.

The jaw is missing, but there is no obvious sign of trauma, other than that the skull is detached from its body, Kirby said.

Now police plan to use a cadaver dog to search the house and grounds for any other remains, Kirby said. Investigators will contact previous homeowners and neighbors for information that may help identify the person.

The skull is small, but it is not obvious whether it belonged to a youth or a small adult, Kirby said. Medical examiners have taken the skull for inspection.

"There's a lot of work yet to be done," Kirby said.

The present homeowners reported they have not been into the attic since the bought the home "a few" years ago, Kirby said. Roofing crews discovered the skull Monday afternoon. Kirby said he does not know the age of the house.