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Miocene flooding events of western Amazonia
The results indicate that shallow marine waters covered the region at least twice during the Miocene, but the events were short-lived, rather than a continuous full-marine occupancy of Amazonian landscape over millions of years.
Comparative morphology of monocot pollen and evolutionary trends of apertures and wall structures
  • M. Zavada
  • Biology
    The Botanical Review
  • 1 October 1983
The evolutionary trends of pollen apertures and wall structure in the monocots parallel those proposed by Walker for the dicots, however, the importance of these trends differ for monocot, suggesting that the selective pressures affecting pollen wall and aperture evolution in dicotylédones have been similar, but with different emphasis.
Mesozoic continental vertebrates with associated palynostratigraphic dates from the northwestern Ethiopian plateau
The East African Rift separates the northwestern and southeastern Ethiopian high plateaus, which are capped by massive Cenozoic volcanics overlying thick deposits of marine and nonmarine Mesozoic
Lygodium Foliage with Intact Sorophores from the Eocene of Wyoming
The Eocene material from Europe and North America represents a single wide-ranging species that was distinct in some features from the Eocene species known from the Southern Hemisphere, and closely resembles extant L. palmatum of eastern North America.
Hormonal Changes after Compatible and Incompatible Pollination in Theobroma cacao L.
The levels of ethylene, indole-3-acetic acid (IAA), and abscisic acid (ABA) were determined after pollination with compatible and incompatible pollen and in unpollinated flowers to characterize the self-incompatibility system in Theobroma cacao.