Pebble, Rock, Stone or Boulder?

[+TechnoNut]

So often we hide caches near, under, on top, and jammed in and among the above.

 

So, how should we describe them?

 

I am thinking of something on the lines of this:-

 

Pebble - sort of marble sized, you can get several in one hand.

Stone - up to about fist size or slightly bigger, can be held in one hand.

Rock - needs two hands to lug around, you are not going to carry this far.

Boulder - this isn't going anywhere. Where you see it is where it stays.

 

Any comments / additions?

 

PT

[+mr panda]

Sounds about right.

Rock isn't a great term, since pebbles, stones and boulders are all made of rock. Geologists use the term cobble.

This might help

http://en.wikipedia.org/wiki/Particle_size_(grain_size)

 

Edit - tried to fix URL, but it is still failing - easy enough to click through.

 

also, silly me, the term 'rock' makes about as much sense as 'stone'.

From the link: (the weird numbers result from the original determinations being in inches)

> 256 mm = Boulder

64–256 mm = Cobble

4–64 mm = Pebble

< 4 mm = Granule, Sand, Silt, Clay etc

Edited September 26, 2011 by mr panda

[+Skyjuggler]

Oh dear....

 

I just had an idea for a mystery

[+mpilchfamily]

If we still consider a rock one of the categories then in my view a rock would be smaller then a stone. But wouldn't it be easier to go with a more conventional designation scheme?

 

Small, medium, and large rocks.

[+Wazat]

I have a cache in amongst an obvious pile of boulders... :-) Retief Klip

[+Zambesiboy]

From the various fun caches I have done in company of other folk this topic always features in the conversation BEFORE we find the cache!

[+mr panda]

@Skyjuggler - A mystery huh? This gives me an idea for an earth cache...