Large, elongate (up to 3 mm) subhedral to euhedral crystals of kaolinite were discovered in the Upper Cretaceous Almond Formation near Rock Springs, Wyoming. The kaolinite is present as a 1-3 inch thick underclay in the lower, non-marine portion of the Almond Formation. The large grain size, its well-developed crystal form, and the lack of abrasion of the delicate kaolinite books indicate that the kaolinite crystallized in place and is not detrital in origin.

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