The bed rock of the moors is Gritstone.
Gritstone or grit is a hard, coarse-grained, siliceous sandstone. This term is especially applied to such sandstones that are quarried for building material. British gritstone was used for millstones to mill flour, to grind wood into pulp for paper and for grindstones to sharpen blades. "Grit" is often applied to sandstones composed of angular sand grains. It may commonly contain small pebbles.
The stone on this small river bed is laid at a slight angle and so the water from the stream runs over it at a fast pace especially when there has been any sustained rainfall.
The base stone is often softer than the small pebbles and crystals embedded in it, so when water erodes the rock it leaves these stones exposed.
At this particular section the pebbles, which are in fact crystals, are quite large, some being up to 1cm long. Many of them are quite white in colour and these are the ones I wish you to concentrate on when you answer the questions below.
You will need to do a little research to decided what the crystals embedded in the base rock are and how they grow.
Questions
- What are the white crystals? (clue; starts with D) (decrypt)
- What conditions enable the crystals to grow to such a large size?
- Why is this section of rock exposed, when all around is deep peat?
- Roughly how far is the exposed rock from the small waterfall to the tunnel?
If you feel willing and able please upload a photo of the cache location.
You may log your find at the same time as sending your message with the answers