Describes a study of microfossils, specifically pollen grains, in the rock formations of the Grand Canyon. The study found both Gymnosperm and Angiosperm pollen grains in all the formations from the Permian Supai down to the Pre-Cambrian Hakati shale. This is significant because the presence of Angiosperm pollen in such old formations challenges conventional evolutionary timelines, which place the appearance of flowering plants much later. The author suggests that these findings support a model of rapid deposition of the Grand Canyon formations. The article also notes the difficulty of explaining the white portions of the Redwall formation using conventional geological timelines