Petrified palm with agate fortifications by sysadmin | Mar 24, 2016 | Blog | 0 comments Petrified palm with agate fortifications- Palmoxylon- Green River Formation, Big Sandy Reservoir, Wyoming. Eocene epoch. – 50 mya . 8″ across polished face; 7″ tall … This fine specimen has 3 fronds protruding from the trunk.