Joan Watson
University of Manchester
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Publication
Featured researches published by Joan Watson.
Review of Palaeobotany and Palynology | 1987
Joan Watson; Helen L. Fisher; Nicola A. Hall
Abstract A previously underscribed conifer from the English Wealden is formally diagnosed as Brachyphyllum castatum sp. nov., based mainly on large numbers of dispersed leaf cuticles. It is characterized by a highly variable though easily recognisable stomatal apparatus. Conites berryi Seward, which is rediagnosed and described here, is the probable female cone of B. castatum . Neither shoot nor cone can be assigned to a family. A formula devised to allow calculation of parastichy numbers from one side of a compressed shoot is appended.
Palaeontology | 2003
Susannah J. Lydon; Joan Watson; Nicola A. Harrison
Use of the genus Sphenobaiera Florin for deeply divided ginkgoalean leaves lacking a petiole is discussed. The type material of the species Sphenobaiera ikorfatensis (Seward) Florin from the Lower Cretaceous at Ikorfat in West Greenland is diagnosed, redescribed and the lectotype designated. The cuticle, which is described and figured in detail for the first time, shows the leaf to be amphistomatic and allows previous identifications of Sphenobaiera ikorfatensis in Lower Cretaceous floras from Siberia and China to be confirmed.
Palaeontology | 2003
Sun Ge; Susannah J. Lydon; Joan Watson
Sphenobaiera ikorfatensis (Seward) Florin from the Lower Cretaceous Huolinhe Formation in the Huolinhe coal–mining area, eastern Inner Mongolia, China, is identified, described and figured. Comparison with the type material of Sphenobaiera ikorfatensis (Seward) Florin from West Greenland confirms its identity. About 20 Chinese leaf specimens are known with well preserved cuticle which is closely similar to the Greenland leaves but more papillate. The palaeoclimatic and phytogeographic significance of the occurrence of this species is discussed in relation to the suggestion that West Greenland, north–east China and eastern Siberia were in the same phytogeographic region during the Lower Cretaceous.
Cretaceous Research | 1996
Joan Watson; Kenneth L. Alvin
Cretaceous Research | 1999
Joan Watson; Kenneth L. Alvin
Palaeontology | 1984
Joan Watson; Helen L. Fisher
Cretaceous Research | 2004
Joan Watson; Susannah J. Lydon
Cretaceous Research | 1999
Joan Watson; Susannah J. Lydon; Nicola A. Harrison
Cretaceous Research | 1998
Joan Watson; Nicola A. Harrison
Botanical Journal of the Linnean Society | 1988
Francis M. Hueber; Joan Watson