If you’ve been to the Weld County Centennial Building, from 1986 to 2011, or the Weld County Administration Building from 2011 to date, you’ve likely seen him… Pops the Triceratops; Weld County’s Official Fossil. Discovered near Briggsdale in 1982 and donated to the county by the landowner, Roland “Sonny” Mapelli, in 1986, the first complete …