This is an EarthCache and has special requirements for logging it. You cannot log a Found It without responding to the logging requirements set out below.
Only one find claim per Message. Each Geocacher claiming a find must submit an individual response. One team can not lodge a response on behalf of a group of people.
Pull off at the side of the road and park safely at the posted parking coordinates. You will be taking a short walk to complete this earthcache.
Everyone knows how to make concrete (commonly called cement): you need a load of gravel, some bags of cement, a few buckets of water and with some energy (manual or mechanical) – now you can mix up some concrete.
The quality of that concrete depends upon the amounts (ratio) of gravel (and how fine the gravel is) or cement that are used.
The process of making sandstone (like these ridges of sandstone you see here) is somewhat similar.
Substitute fine-grained sand for gravel, minerals of various kinds for the bags of cement, gravitational pressure as the energy, and water to bring it all together, and over the (often thousands of) years, you end up with huge areas of sandstone rock.
The quality (hardness) of the sandstone similarly depends upon the ratio of sand to mineral.
Now getting a bit more technical.
The formation of sandstone involves two principal stages. First, a layer or layers of sand accumulates as the result of sedimentation (where the sand is able to settle to the bottom), either from water as in a river (the sea or lake too) or from air (as in desert areas where the sand is dry). Then, once it has accumulated, the sand becomes compacted by the pressure of overlying deposits and cemented by the precipitation of minerals within the pore spaces between sand grains.
OK, so far so good.
The most common cementing material is silica, but calcium carbonate and iron oxide (and others) are also cementing materials. Just how and when these cement agents are depositied in not really clear. Colours will usually be tan or yellow from a blend of the clear quartz - the hard part of sand - with the dark amber feldspar content of the sand. If you would like some clarification about the difference between quartz and feldspar, click HERE.
A predominant additional colourant is iron oxide, which imparts reddish tints ranging from pink to dark red (terracotta), with additional manganese imparting a purplish hue.
But what about hardness?
The hardness of sandstone is variable, i.e. soft to hard, dependent on clast (size of the sand particles) and cement composition. If the cementing material is 'weak' then the sandstone is more likely to suffer from weathering, in which case it will crumble more readily. Weathering is the breakdown of rocks at the Earth’s surface, by the action of rainwater, extremes of temperature, and biological activity. It does not involve the removal of rock material.
LOGGING REQUIREMENTS:
Part One. Walk a few meters to the corner edge of the "cliff" near the road to these coordinates: WP1 - S 24 18.127E 146 21.741 where you will see some “soft” sandstone in some small cave-like holes. Touch and feel the sandstone components here.
1, Describe the texture – what is feels like, how it looks, etc.
2. What might be “missing” to cause this?
Part Two. Walk further in to the bush to these coordinates: WP2 - S 24 18.114 E 146 21.583 and look up at the the "cliff" face (perhaps slightly to your left).
3. What can you say about the hardness of this particular rock formation compared to the one you described above in Q1?
Part Three. Please stay on the road side of the fence and walk to your right now, to these coordinates: S 24 18.113E 146 21.654 and look up at the very long cave-like hole in the west-facing side of the ridge.
4. What geological processes might have been at work in what you can see?
Part Four. Take of photo of yourself OR your GPS to show a view of GZ. Include it in your message, but please do not post it in your log, it might give too much away.
When you have your response to the above questions, please, if possible, Message us, using the link at the top of the page underneath the name of the Cache. We prefer the Message method, as apparently, we don't respond to emails very well, but messages we do. We will contact you by Message once your Message has been received.
But please log your Found It 
in the meantime, and just say that you have Messaged your answers to the CO. We do reply to all logs within reasonable time, and if there is a problem with your answers, we will ask you for further clarification.
Happy Earthcaching!