Despite minimal secondary school education, Wiffen studied dinosaurs for more than 30 years and in the process became immortalised as a giant in the field of palaeontology by her peers worldwide.
Her husband had enrolled in night classes in geology, but became ill so Joan went in his place. In the 1970s Joan and her husband Pont tracked down a map from a petroleum company that noted "reptilian bones'' in the Te Hoe Valley.
On the verge of retirement they took up prospecting for fossils and by 1980 they had discovered the single bone of a dinosaur - the first in New Zealand.
Joan went on to find half a dozen other dinosaurs and in 1994 received an honorary doctorate from Massey University.
The following year she was made a CBE and in 2004 Joan accepted the Morris Skinner Award from the US-based Society of Vertebrate Palaeontology for outstanding and sustained contributions to scientific knowledge.
"Joan showed that the interested, logical and critical mind is the single most important factor in success," vertebrate palaeontologist Dr Ralph Molnar said at the time of her death, aged 87, in 2009.
"She showed that a person with these qualities can make important contributions to their chosen field. She will be long remembered and much missed.''
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