The Milk River Formation, a prograding clastic wedge, outcrops in a limited area of southern Alberta, Canada. The indicated age of the formation is latest Santonian to possibly earliest Campanian; its upper contact with the Pakowki Formation is unconformable. The unit is comprised of three members: Telegraph Creek, Virgelle and Deadhorse Coulee. All three members yielded well-preserved terrestrial palynomorphs. The assemblages characterizing the formation contain an abundance of species, with Accuratipollis lactifluminis sp. nov., Brevimonosulcites corrugatus and Callialasporites dampieri being the more common characteristic types.

Eighteen new species are described including: Accuratipollis lactifluminis, Annulispora salsa, Integricorpus scopulensis, Cupanieidites terrestris, Cupuliferoidaepollenites quietus, Diptycha badlandensis, Echinatisporis solaris, Enzonalasporites bojatus, Erdtmanipollis circulifer, Hedlundisporites tricrassus, Leptolepiditescrepitus, Micahoodooensis, Monosulcitesriparius, Periretisyncolpites chinookensis, Perotrilites monstrum, Satishia nigra, Trilobapollis laudabilis and Triquitrites absurdus.

Seven new combinations are proposed including: Echinatisporis caudata (Krasnova), Foraminisporis simiscalaris (Paden Phillips & Felix), Integricorpus kokufuense (Takahashi & Shimono), Integricorpus protrusum (Takahashi & Shimono), Integricorpus teretes (Zhou & Wang), Zlivisporis cenomanianus (Agasie), and Zlivisporis simplex (Cookson & Dettmann). A new name, Tsugaepollenites stelmakii, is proposed.

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