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Figure F3. A. Results of mantle flow modeling for the Louisville hotspot showing a maximum paleolatitude shift of only ~2.5° at 60 Ma (similar to Steinberger et al., 2004). B. Revised model constrained by a plume initiation age of 90 Ma and new 40Ar/39Ar ages (Koppers et al., 2004). C. Variations in predicted motion of the Louisville hotspot based on a range of model assumptions, such as location of the present-day hotspot, mantle plume initiation ages, and mantle-viscosity models (Steinberger and Antretter, 2006).

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