Panmure Basin - Kaiahiku (Auckland)
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A Earthcache around Panmure Basin.
Panmure Basin was formed some time between 12,000 to 11,000 BC when a violent volcanic explosion formed a crater with a surrounding lip of debris. Centuries later the eruption of Maungarei diverted a stream which slowly filled the crater eventually breaching a chasm through the lip to the Tamaki River. Thus was formed Kaiahiku, Panmure Basin and its connection to the tidal estuary.
Panmure basin is a maar. A maar is a broad, low relief crater that is caused by a phreatic eruption or explosion caused by groundwater contact with hot lava or magma. The maar typically fills with water to form a relatively shallow crater lake. The name comes from a local German dialect of Daun, which is in turn derived from Latin mare (sea). Maars are shallow, flat-floored craters that scientists interpret have formed above diatremes as a result of a violent expansion of magmatic gas or steam; deep erosion of a maar presumably would expose a diatreme. Maars range in size from 60 meters (200ft) to 2000m (6,500ft) across and from 10 meters (30ft) to 200 meters (650ft) deep, and most are commonly filled with water to form natural lakes. Most maars have low rims composed of a mixture of loose fragments of volcanic rocks and rocks torn from the walls of the diatreme.
No night time visits please, as you wont see to much, and the area is pretty dodgy!
To log this EarthCache, you must do the following and email us the results. You can go ahead and log your find, (ie. you don't need to wait for permission) but if we don’t think you have honestly completed the required tasks we will delete your log (after emailing you first of course):
a) The listed cords should take you to a commemorative plaque about the area. Please email me the year the families arrived and the name of there ship. Email me the answer, dont log them.
It is here at this mark you will need to reset your "tripometer" on your GPS, as you need to walk around the crater/lake, and email me the distance around the crater, via the sealed path.
B) Go to S 36 54.394 E 174 51.184 .This area gives you a good overview of the basin. Take a photo of yourself and/or your gps, with the basin and volcano in the background. Post this with your log.
C) Go to S 36 54.448 E 174 50.669 . Please email me whats at this site. You should see a sign, email me the first and last words please. Dont log them
Dont post the answers in you log, just post the photo
(No hints available.)
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Coordinates are in the WGS84 datum