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At Checkerboard Mesa Dick Heermance illustrated the process of dune cross bed formation and how paleowind direction is determined. He also explained what evidence is used to determine if cross beds are eolian or water generated. Robinson Cecil pointed out that some of the sands in this Jurassic dune field came from as far away as the Appalachian Mountains. And finally Doug Yule posed the question as to what process was responsible for creating the “squares” on the checkerboard.