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Submitted on: 06 June 2009.
Revised on: 03 October 2009.
Accepted on: 24 October 2009.
___________________Earth and Environmental Science Transactions of the Royal Society of Edinburgh
Submitted on: 20 July 2012.
Revised on: 11 August 2012.
Accepted on: 05 September 2012.
___________________Earth and Environmental Science Transactions of the Royal Society of Edinburgh
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Submitted on: 30 May 2004.
Revised on: 15 August 2004.
Accepted on: 01 October 2004.
___________________Earth and Environmental Science Transactions of the Royal Society of Edinburgh
Submitted on: 19 April 2006.
Revised on: 22 May 2006.
Accepted on: 18 June 2006.
___________________Earth and Environmental Science Transactions of the Royal Society of Edinburgh
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