Maungatautari (red marker) and its andesite deposits (red shading). The basaltic andesite of Te Tapui is towards top of map.
Clicking on the map enlarges it, and enables panning and mouseover of volcano name/wikilink and ages before present. Key for the volcanics that are shown with panning is: basalt (shades of brown/orange), monogenetic basalts,
Maungatautari is an extinct 797 metres (2,615 ft)[1] high andesitic-daciticstratovolcano with a prominence of at least 600 m (2,000 ft) above its surroundings and an estimated age of 1.8 ± 0.10 million years.[2] Its eroded flanks take in most of the surrounding district of the same name as its edifice is between 6 km (3.7 mi) to 8 km (5.0 mi) in diameter but it does abut an exposed greywacke basement range to its west,[2] south of Lake Karapiro. A wide range of volcanic rocks are found from pumiceous and ash flow deposits near the summit and hydrothermally altered andesite on its southern flanks to labradorite, pyroxene, and hornblende andesite and dacite in the bulk of the stratovolcano and a small cone of olivine basalt is located at Kairangi, 7 km (4.3 mi) to the northwest.[5] However the Kairangi cone is much older being the most eastern of the basaltic Alexandra Volcanic Group. Maungatautari's surface ring plain deposits are mainly on the northern and northeastern flanks and include a prominent rock and debris avalanche to the north east of volume 0.28 cubic kilometres (0.067 cu mi),[5] as to its south and east the flanks are covered by the younger and very thick ignimbrite sheets from the massive Mangakino caldera complex eruptions of about 1 million years ago.[2]
