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New Zealand geologist (1932–2026)

Also known as: Dr Ian Speden, I. G. Speden, Ian G. Speden, Ian Gordon Speden, Speden

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Known works

Cretaceous stratigraphy of Raukumara Peninsula
The type Fox Hills Formation, Cretaceous (Maestrichtian), South Dakota
Illustrations of New Zealand fossils
Environmental audits and appraisals, 1976-81
Geology of Papatowai subdivision South-East Otago