Definition, age, and correlation of the Clarence series stages in New Zealand (late early to early late Cretaceous) von Crampton, James S., Tulloch, Andy J., Wilson, Graeme J., Ramezani, Jahan, Speden, Ian G.

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Fossil localities in Torlesse rocks of the North Island, New Zealand von Speden, Ian G.

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Three new inoceramid species from the Jurassic of New Zealand von Speden, Ian G.

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Predation on new zealand cretaceous species of Inoceramus (bivalvia) von Speden, Ian G.

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Distribution, stratigraphy and stratigraphic relationships of cretaceous sediments, western Raukumara Peninsula, New Zealand von Speden, Ian G.

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Paleoecology and the study of fossil benthic assemblages and communities von Speden, Ian G.

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Early Jurassic (Ururoan Stage) Pseudaucella from Canterbury Suite rocks at Kaiwara, North Canterbury von Speden, Ian G.

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Geology of Mt Taitai, Tapuaeroa valley, Raukumara Peninsula von Speden, Ian G.

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An association of the Late Triassic bivalves Halobia, Manticula, and Monotis in the Torlesse rocks of North Canterbury von Speden, Ian G.

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Inoceramus opetius in the Kahuitara Tuff, Chatham Islands, New Zealand von Speden, Ian G.

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Additional details of the morphology of Maccoyella incurvata waterhouse and a reconsideration of the age of the genus Maccoyella von Speden, Ian G.

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Probable synonymy of the lower cretaceous bivalves Maccoyella reflect a (Moore) and Maccoyella magnat a Marwick von Day, R. W., Speden, I. G., Fleming, C. A., Waterhouse, J. B., Speden, Ian G.

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Ecology of Pleistocene Molluscs from Marthas Vineyard: A Reconsideration von McAlester, A. Lee, Speden, Ian G., Buzas, Martin A.

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Stratigraphy, structure, and inferred environments of deposition of the Early Cretaceous sequence, eastern Wairarapa, New Zealand von Moore, P. R., Speden, Ian

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Notes from the New Zealand Geological Survey—8: Spelling of the specific name Inoceramus Matotorus Wellman, 1959 von Speden, Ian, Warren, Guyon

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