This webpage, published by G.R. Foulger on the mantleplumes.org website, argues against a simple deep-mantle plume as the origin of the Yellowstone hotspot. Foulger makes his case on the basis of a diverse number of geologic, geophysical, and structural observations, and argues that upper-mantle (< 200 km) processes can explain the observations. The site is accompanied by a variety of illustrations and a bibliography.