there is no gritstone anywhere in the world apart from the north of england. is this true?
is this grit or is it sandstone/grit? have you been? is there any other type of rock that is indigenious to that particular area anywhere in the world?
if I can find some free hosting I'll put em up.
Dense wrote:is there any other type of rock that is indigenious to that particular area anywhere in the world?i meant there's only grit here n (now) in ireland. sandstone, lime n granite get everywhere. is there anythin else? gabbro in scotland n wales etc
Volcanic rocks like granite.
Most of the binding material in typical grit is an Iron based mineral called lignite.
So grit ain't common cos the way it got laid down is pretty unusual. Also exactly wot the mountains were made of affects the sand. So there could be grit in mongolia but its very unlikely it will be exactly the same.
[Most grit cements are actually a mixture of iron hydroxides, quartz and clays, which is why it's so variable.
Doh - I meant to say calcite rather than quartz.
Quote from: "AndyR"Doh - I meant to say calcite rather than quartz.shocking, i don't know where you lot bought your geology degree's from but i'd be asking for a refund............................
no they don't have grit, i think they're called griddles now. if they did have grit it would be bigger n better than our's n they wouldn't let us forget it. a fairly safe bet that they don't have it then. sorry blunk
i think you'll find granite under the section that says igneous rock, not volcanic............
I haven't climbed in the eastern US, but there's a good chance that there may be grit there - this is because the appalachians are the same chain of mountains as the scottish highlands - so any proximal deltaic sediments formed from the eroding hills could be very grit-like.