approximately when was the Pacific Ring of Fire Forms and/or Titled?

the Pacific ring of fire was formed when the earth was formed about 4.6 billion years ago
http://www.extremescience.com/earth.htm

More information on the Pacific Ring of Fire
http://pubs.usgs.gov/gip/dynamic/fire.html

http://www.windows.ucar.edu/tour/link=/earth/interior/RIM_of_FIRE.html

http://www.pbs.org/wnet/savageearth/hellscrust/html/sidebar3.html