DOWNTOWN SAN DIEGO â€" More prehistoric bones â€" this time, those of a giant sloth â€" have been found at the East Village construction site of the Thomas Jefferson School of Law, the school said yesterday. But the bones are in poor shape and may not be salvageable.

The bones â€" part of a vertebra, as well as tooth and skull fragments â€" were unearthed Friday in a different part of the site from where whale and mammoth bones were found last month. The sloth bones were found at about the same depth as the whale bones, indicating the sloth lived about 600,000 years ago.

Paleontologist Pat Sena of the San Diego Natural History Museum, who found the sloth bones, said the bones are poorly preserved.