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BUTTERWORTH, M. A., SPINNER, E. 1967. Lower Carboniferous spores from north-west England. Palaeontology, 10, 1, 1–24.
Mavis A. Butterworth and Edwin Spinner Assemblages of spores are described from coals and shales of the Lower Carboniferous (Bewcastle Beds to the Lewis Burn Coal Group) of north-west Cumberland and Northumberland. Forty-three species are recorded. The following new taxa are proposed: (Megaspores) Setispora gen. nov., Aneuletes reticulata, Setispora pseudoreticulata, Triangulatisporites? membranatus, Zonalesporites conacies; (Miospores) Convolutispora planimuricata, Dictyotriletes plumosus, Lophotriletes plicatus, Lycospora rugulosa, Orbisporis convolutus, Tholisporites cumbriensis. The Palaeontological Association (Free Access)