Whilst hiking to another cache, Mr. CEC came across rocks suspended on poles, under a CN rail bridge. Each rock is a different material (at least, compared to the rock beside it), and each one has a unique number engraved on it. There is no explanatory sign, and we couldn't find any information about them online, either. We're curious to find out what this location is about. So we decided to make this spot stage 1 of a multi! (as this location is too close to another cache to put a physical cache here)
To get the coordinates of the final, you're going to have to do some arithmetic. North: subtract the last 2 digits of the number on the 8th rock (facing the rocks, counting from the left) from the decimal minutes of the posted North coordinates. West: add 100x the digital root of the number on the rock 2nd from the right, to the decimal minutes of the posted West coordinates. The final is on a hillside, and was a bit slippery when I placed the cache, hence the terrain rating. The rest of the way is paved walking trail (which was also quite slippery with 1cm of snow the day I placed the cache).
The cache container is a camo'd 500ml peanut butter jar. The coordinates were averaged using an Oregon 550. The posted coordinates may be a little off (due to bridges, hills, etc.) but the location should be obvious.
Update (28 April 2013): another cacher mentioned that there is now a sign saying that the rocks represent the highest water levels at the various years. That is very interesting, especially since _all_ the water levels noted would swamp the path! Now we are wondering why the water levels were so high in those years! And is there any significance to the rock types chosen for those years??
Update (10 Aug 2019): the final location and cache container have moved a few metres to the West. The container is now a coffee tin with a yogurt container inside it.