The microplankton from Liassic localities in Yorkshire, Dorset, and Lincolnshire, England, and Glamorgan, south Wales, consists of small acritarchs and some leiospheres and dinoflagellates; the palynomorphs include Classopollis, araucarian and bisaccate pollen, inaperturate forms, and a variety of trilete spores. New genera and species are represented in the material systematically described. Type of assemblages and their stratigraphic changes are related to changing environments controlled by succeeding cycles of sedimentation.

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