> Haven't seen a reply to your post Lyn. Hmm...I also didn't see my reply, so let me try again :-) > Can I check with you - is the rock of Orkney all sandstone? The vast majority is Middle and Upper Old Red Sandstone and some other sandstones and siltstones, but not all. There's a granite intrusion around Stromness and a few sills and dykes of dolerite, camptonite, monchiquite and bostonite; also one or two breccia sediments here and there. And if I could put my hand on my copy of 'British Regional Geology: Orkney and Shetland' then I'd mention a volcanic vent or two...but I can't so I won't. But it's *practically* all sandstone. Martin -- Martin McCarthy /</ http://www.non-prophet.org marty@ancient-scotland.co.uk \>\ http://www.ancient-scotland.co.uk /</ http://www.ehabitat.demon.co.uk

Thanks, Martin, got this one! I presume the stones at Stenness and Bodgar are all sandstone too? Lyn ----- Original Message ----- From: "Martin McCarthy" <marty@ancient-scotland.co.uk> To: <ORCADIA-L@rootsweb.com> Sent: Sunday, February 29, 2004 12:58 PM Subject: Re: [<orcadia>] Rocks of Orkney > > Haven't seen a reply to your post Lyn. > > Hmm...I also didn't see my reply, so let me try again :-) > > > Can I check with you - is the rock of Orkney all sandstone? > > The vast majority is Middle and Upper Old Red Sandstone and some other > sandstones and siltstones, but not all. > There's a granite intrusion around Stromness and a few sills and dykes > of dolerite, camptonite, monchiquite and bostonite; also one or two > breccia sediments here and there. > And if I could put my hand on my copy of 'British Regional Geology: > Orkney and Shetland' then I'd mention a volcanic vent or two...but I > can't so I won't. > But it's *practically* all sandstone. > > Martin > -- > Martin McCarthy /</ http://www.non-prophet.org > marty@ancient-scotland.co.uk \>\ http://www.ancient-scotland.co.uk > /</ http://www.ehabitat.demon.co.uk > > > ==== ORCADIA Mailing List ==== > To unsubscribe from the Orcadia mailing list, send an e-mail with the word > 'unsubscribe' in the message body to orcadia-l-request@rootsweb.com > > >

> I presume the stones at Stenness and Bodgar are all sandstone too? Yes - I don't know of (not a definitive answer!) any Orcadian standing stones that aren't sandstone. M -- Martin McCarthy /</ http://www.non-prophet.org marty@ancient-scotland.co.uk \>\ http://www.ancient-scotland.co.uk /</ http://www.ehabitat.demon.co.uk