Post-conference field trip (FT#) Auckland Volcanoes
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- Gwendolyn Cunningham
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1 Post-conference field trip (FT#) Auckland Volcanoes OVERVIEW: Auckland City is built over and out of the 53 volcanoes in the Auckland Volcanic field. All erupted within the last 200,000 years and therefore many still have well preserved volcanic landforms. These monogenetic basalt volcanoes erupted in three different styles that produced three different rock types and three different types of landform. Wet explosive phreatomagmatic eruptions built tuff rings surrounding maar craters. Dry explosive fountaining eruptions built the iconic scoria cones of Auckland and the quiet effusion of basalt lava constructed lava flow fields and small shields. This tour will start (9 AM) and finish (5 PM) at the conference Cordis Hotel. We will visit examples of all these volcanic landforms and rocks with short steep climbs up Mt Eden and Mangere Mt scoria cones, views of the Domain and Pupuke maar craters and visits to Takapuna fossil forest preserved as moulds in a lava flow and Ihumatao fossil forest killed by base surge blasts and preserved in the resulting tuff ring. On our tour we will see much of Auckland including the Harbour Bridge, Takapuna Beach, Lake Pupuke, Auckland Domain and the Manukau Harbour foreshore. LEADER: Dr Bruce W Hayward, Geomarine Research Bruce Hayward is a recently retired formerly self-employed research geologist. Although he specialised in foraminiferal micropaleontology he has published many books on the geology and history of northern New Zealand including the definitive Volcanoes of Auckland: The essential guide, Auckland University Press, 2011, 234 p. START: Saturday 6 April END: Saturday 6 April DURATION: One day Low Tide Waitemata Harbour 3.10 PM. Low tide Manukau Harbour 6.30 PM.
2 PROVISIONAL ITINERARY Auckland Domain castle and moat volcano and views; Mt Eden scoria cone and views; Lake Pupuke maar carter; Takapuna Beach fossil forest in lava flow; Mangere Mountain scoria cone, tholoid and views over lava flow field; Ihumatao fossil forest in tuff. INCLUDED: Bus tour with guide around Auckland. NOT INCLUDED: Lunch, refreshments and drink SPECIAL REQUIREMENTS: A moderate level of fitness is required. Sturdy footwear is advised as we will be traversing a variety of substrates (pavement, gravel, long grass, intertidal rocks, wet muddy sand). Wet weather gear, sun hat and sunscreen are recommended. Participants must take all the food and drink they require for the day. MAXIMUM NUMBER OF PARTICIPANTS: 40 MINIMUM NUMBER OF PARTICIPANTS: 15 COST: To be advised. NOTE: This field trip is subject to confirmation and minimum numbers. FURTHER INFORMATION: Bruce Hayward at b.hayward@geomarine.org.nz REGISTRATION: Visit GALLERY Auckland Domain castle and moat volcano (maar, tuff ring and scoria cone).
3 Maungawhau/Mt Eden scoria cone. Note pre-european Maori terracing and pa (fort). Lake Pupuke maar with Takapuna Beach beyond.
4 Takapuna fossil forest tree stump moulds in basalt. Taqkapuna fossil forest mould of fallen large kauri tree trunk in basalt lava flow. Volcanic bomb, Mangere Mountain.
5 Mangere Mt scoria cone. Ihumatao fossil forest - tree knocked sideways by base surge eruption and preserved in tuff.
6 ROUTE MAP
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Coso Red Hill and Coso Playa field trip, Prof. Alessandro Grippo, Ph.D.
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