Worldwide stratigraphic occurrences of Mesozoic and tertiary megaspores

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Abstract
This paper presents data on the stratigraphic ranges of all known Mesozoic and Tertiary megaspores from around the world and demonstrates the potential of these palynomorphs for dating and correlating sedimentary sequences. Forms referable to more “natural”; genera such as Ariadnaesporites and Paxillitriletes, as opposed to those that are based solely on sculptural morphology, are particularly important because not only are they among the most reliable of biostratigraphic indicators but they also have the greatest value to biologists concerned with the evolution of heterosporous plants. There is, however, much work to be done before megaspores can be used on a regular basis for solving geological problems.