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2. Aspects of palynomorph distribution, floral provinces and climate during the Cretaceous;Batten;Geologisches Jahrbuch, A,1987
3. Middle Cretaceous floral provinces and early migrations of angiosperms;Brenner,1976
4. Terrestrial palynomorph biostratigraphy of the lower part of the Mannville Group (Lower Cretaceous), Alberta and Montana;Burden;Canadian Society of Petroleum Geologists Memoir,1984
5. Morphology of triprojectate fossil pollen: form and distribution in space and time;Farabee;Botanical Review,1993