SAN JOSE, Calif. - The fossilized bones of a creature that might have been a mastodon were unearthed Tuesday in the creek bed of a suburban river being renovated for flood protection. The remains of what appears to be a massive pelvic bone, ribcage fragments and a tusk were uncovered along the Guadalupe River in San Jose. The river project has been cited as a model of how to integrate nature and development. The discovery prompted both wonder and frustration, as officials tried to determine the source of the remains but couldn't find experts to scour the site. "We've never...