The scoria cone sits in the centre of a large explosion ( maar ) crater with the tuff ring arc still present around the south and east sides.
32.
It created a 200-meter hole in the east-northern border of the tuff ring, and then emptied, creating a small trachyandesitic lava flow.
33.
The first eruptive period produced a tuff ring and a } } long basaltic andesite lava flow about 100, 000 years ago following a period of glacial retreat.
34.
Even higher water levels are recorded on the tuff cliffs and at one point only the tops of the tuff ring were exposed as rocky islands in this inland sea.
35.
It has an explosion crater around 500 m wide, and tuff ring up to 30 m high, which has been eroded away on the south-western side.
36.
The park is home to one of Auckland's main tourist attractions, the Auckland War Memorial Museum, which sits prominently on the crater rim ( tuff ring ).
37.
Over time Surtseyan eruptions tend to form maars, broad low-relief volcanic craters dug into the ground, and tuff rings, circular structures built of rapidly quenched lava.
38.
Strombolian eruptions during the second and final eruptive period about 10, 000 years ago constructed a small pyroclastic cone on the eastern rim of the older basaltic andesite tuff ring.
39.
The ages of the Grafton and Domain volcanoes are not known precisely, although a tree under the Domain tuff ring was radiocarbon dated at over 50, 000 years old.
40.
While at higher elevations cinder cones predominate, the western tip of the island is characterized by a series of basaltic tuff rings, of which the largest is about in diameter.
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