Woolly mammoth tooth unearthed by builders in downtown San Francisco is hailed by experts as 'significant find'

[Mail Online]  The tooth, which still has intact enamel, was dug up by a crane operator during an excavation for a new transit centre in the city. The ten inches long, mud-coloured tooth has been called a ‘significant find’ by local paeleontologists who believe it could be 11,000 years old