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Pukaki Lagoon : ウィキペディア英語版 | Pukaki Lagoon
Pukaki Lagoon is one of the volcanoes in the Auckland Volcanic Field. It has a 600 m wide explosion crater, with a surrounding tuff ring. After eruption about 65,000 yrs ago the crater filled with freshwater and became a lake. It was breached by the sea as sea-level rise after the end of the Last Ice Age about 8,000 yrs ago and became a tidal lagoon. This was dammed and drained and used as a speedway from 1929 into the 1930s (Henning's Speedway). It is now farmland. ==References==
*''City of Volcanoes: A geology of Auckland'' - Searle, Ernest J.; revised by Mayhill, R.D.; Longman Paul, 1981. First published 1964. ISBN 0-582-71784-1. *''Volcanoes of Auckland: The Essential Guide''. Hayward, B.W., Murdoch, G., Maitland, G.; Auckland University Press, 2011.
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