The stratigraphic utility of small marine acritarchs in the Neogene has been known for more than a decade (e.g., de Vernal and Mudie, 1989). Their potential for biostratigraphy in the Cretaceous is also well known, and was elegantly elucidated by Habib and Knapp (1982) in a detailed scanning electron microscope (SEM) study from the western North Atlantic. Habib and Knapp erected 12 new acritarch genera including the acanthomorph genus Nannobarbophora and its three species N. barbata (the name of the type), N. pistilla, and N. platforma. A diagnostic feature of Nannobarbophora is the presence of spinules concentrated...

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