Reset A park ranger from California has made what’s being hailed as the ‘most significant’ fossil find in the state’s history. The tusks uncovered at the site. Image credits Jason Halley / California State University Photographer. Greg Francek, a ranger naturalist with the East Bay Municipal Utility District (EBMUD), a public utility district that provides water and sewage treatment services around San Francisco, has recently been on quite an adventure. While at work in the Mokelumne River watershed area — in the foothills of the Sierra mountains southeast of Sacramento — he stumbled upon an ancient, petrified woodland. Here, he found a treasure trove of fossils.