Most people have heard of the Yellowstone hotspot, an idea that has been around for half a century. Supporting this concept is a line of volcanism beginning in northern Nevada about 16.5 million years ago and getting more recent as it extends up the eastern Snake River Plain to Yellowstone, which last erupted about 700 thousand years ago. This path generally aligns with the motion of North America, which has been on a nearly straight path for about 80 million years.

Far less well known is that there is a near mirror image track apparently beginning a bit further north and growing more recent in the opposite direction toward the Newberry Volcano near Bend, Oregon. Newberry last erupted about 1300 years ago and is considered a volcanic hazard. One can find many maps of the Yellowstone trend but none of the Newberry trend despite widespread acknowledgement in the literature, so I made one