Cave Stream (Canterbury) EarthCache
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The reserve is in a high country basin - a low depression bounded by fault-lines along the Craigieburn and Torlesse mountain ranges.
Karst topography is the name given to a limestone landscape. Rain water combines with soil elements (primarily carbon dioxide) to produce a weak acid, which over time trickles into joints and cracks, dissolving the limestone.
The cave has formed with the limestone dissolving over time, diverting Cave Stream from its original surface channel. The abandoned channel is left as a dry valley near the upstream end of the cave.
The form of the limestone bluffs is characteristic of solution weathering of limestone. Depressions in the ground’s surface, or sinkholes, can be seen from the carpark. They are typical in a karst region.
A line of three sinkholes can be seen on the river terrace near the carpark immediately above the cave. These have let water in to enlarge a joint that runs down the cave’s length, and are responsible for some of the vertical development of the present cave. The terraces upstream of the cave inlet were formed many thousands of years ago by a glacial fed river.
Vegetation
Matagouri can be found at Cave Stream Scenic Reserve The vegetation of the reserve has been greatly modified. Original plant life would have been low forest of totara, broadleaf/papauma, kowhai and other small leafed shrubs. Burning, over-sowing with introduced grass species and grazing has left introduced grasses as the main vegetation. The only remaining areas of original vegetation are an assortment of native species in the limestone bluffs and crannies. Large shrubs found here include mountain wineberry/makomako, matagouri, mingimingi/Coprosma propinqua, a few Hebe cupressoides, Helichrysum intermedium, and porcupine shrub/Melicytus alpinus. There are also a few ferns and smaller shrubs including the characteristic limestone fern/Asplenium lyallii, the fern Cystopteris tasmanica and a threatened native forget-me-not/Myosotis colensoi.
Wildlife
There is an abundance of invertebrate fauna in and around the limestone reserve. In the “dark zone” of the cave, a rare species of arachnid, the cave harvestman, is found. This feeds on insects and other small cave creatures. It is known to live only in this cave and one other on the West Coast.
History
Evidence of Maori occupation in the Cave Stream area includes rock-art, artefacts and signs of seasonal camps.
On the ridge above the reserve an old Maori backpack was found in a small rock shelter. It is made from flax, with a wooden frame, and has broad straps. Intricately woven flax over the frame could stretch in both directions to accommodate the pack’s contents. Finding this pack confirmed traditional knowledge that Maori used packs, similar to the modern day pack, for carrying loads. The pack is estimated to be 500 years old and can be seen in the Canterbury Museum.
The first European to explore the area was Joseph Pearson, in 1857. Pearson was commissioned to select land for Joseph Hawdon, who took up the original Craigieburn (including Flock Hill) and Grasmere runs. Hawdon was also responsible for the naming of many local features.
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):
1) Measure the width of the caves mouth. Email me the answers.
2) Take an altitude reading with your gps, tell me your meters above sea level at GZ. Email me the answers.
3) Using a compass/GPS, tell me what direction the cave runs
4)The underground stream now runs into what river?
5) Take a photo of yourself, and GPS with the cave in the background. Please post the photo with your online log..
Please email me this info, please DO NOT post it with your log. Just post your photo.
Permission given by:
Chris Stewart
Field Centre Supervisor
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