A new platyspermic permineralised seed from the middle Jurassic of Queen Charlotte Islands, British Columbia, Canada.

King, Mervyn Daniel Thomas (2001). A new platyspermic permineralised seed from the middle Jurassic of Queen Charlotte Islands, British Columbia, Canada. MPhil thesis The Open University.

DOI: https://doi.org/10.21954/ou.ro.0000f99f

Abstract

A description is given of the morphology, anatomy and affinities of a new permineralised seed from South Balch Island in the Queen Charlotte Islands, British Columbia, Canada. The seed is named Dawsonocarpus haidorum gen. et sp. nov. This platyspermic seed has features which show relationships with extant members of the Cycadales, coniferopsids and Gnetales together with Palaeozoic seeds e.g. platyspermic cordaites. These seeds are found in association with Cycadeocarpus columbianus Dawson in the Yakoun Formation, Vancouver Group, dated as Middle Jurassic (Bajocian), from associated ammonites. The seeds, in common with Cycadeocarpus columbianus, are calcified in a pyroclastic matrix and may be readily examined by conventional peel techniques and SEM.

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