Petrified wood-Serviceberry(Amelanchier sp.) by sysadmin | Jan 30, 2016 | Blog | 0 comments Petrified wood-Serviceberry(Amelanchier sp.)- Trout Creek Formation, Bretz Mine Airport Site, Malheur County, Oregon. Miocene epoch. 13″ across This site is near McDermitt, Nevada, just over the border, into Oregon.