The Canterbury Plains are a pretty unexciting place in the whole "geological features" department, they just gently roll from the base of the foothills to the sea or Banks Peninsula, with only a couple of rivers to divide them. As a result, it makes this location a comparable "Harwood's Hole" of Prebbleton - an old shingle pit that is being restored to its natural state by the SDC and the local community - but just not quite enough for an earthcache 
Extraction of road shingle began in 1865 and the pit was worked on and off until the mid 1970's. Restoration began in 2004 and with over 6,500 native plants planted it's well on the way to becoming a refuge for native birds. Have a read of the info in the holder at the entrance (no questions to answer, no photos needed), don't play on the tree swing (I did when I placed it but the tree is now a car park), have a look at the shingle layers and have a wander around whilst you hunt for a 500ml Sistema cache.