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Submitted on: 29 October 2001.
Revised on: 13 February 2002.
Accepted on: 05 April 2002.
___________________Earth and Environmental Science Transactions of the Royal Society of Edinburgh
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Submitted on: 24 February 2006.
Revised on: 29 May 2006.
Accepted on: 14 June 2006.
___________________Earth and Environmental Science Transactions of the Royal Society of Edinburgh
Submitted on: 12 July 1998.
Revised on: 03 September 1998.
Accepted on: 17 October 1998.
___________________Earth and Environmental Science Transactions of the Royal Society of Edinburgh
Submitted on: 04 April 2009.
Revised on: 10 July 2009.
Accepted on: 20 August 2009.
___________________Earth and Environmental Science Transactions of the Royal Society of Edinburgh
Submitted on: 15 June 2005.
Revised on: 20 September 2005.
Accepted on: 02 November 2005.
___________________Earth and Environmental Science Transactions of the Royal Society of Edinburgh
Submitted on: 07 August 2013.
Revised on: 25 October 2013.
Accepted on: 27 November 2013.
___________________Earth and Environmental Science Transactions of the Royal Society of Edinburgh
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