Grazing livestock would have more impact on scrub vegetation than it would on forests. Four thousand years ago would put us back into what..the late Neolithic? Is there archeological evidence of herding on Orkney that far back? If so then humans could a cause,,or at least a contributing factor. R -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Charles Tait Sent: Monday, September 10, 2007 12:08 PM To: [email protected]; [email protected] Subject: Re: [ORCADIA] Wind Pollen studies show that after the Ice Age Orkney was covered by scrubby trees, which gave way to grass and moorland by before 4000BC, perhaps under the influence of people and their grazing animals. ------------------------------- To unsubscribe from the list, please send an email to [email protected] with the word 'unsubscribe' without the quotes in the subject and the body of the message