1904 Dr Mackie proposed a basic theory for plate tectonics in a lecture to the Elgin Institute .
In 1918 he was elected a Fellow of the Royal Society of Edinburgh. His proposers were John Horne, Ben Peach, Sir John Smith Flett and Robert Kidston. Aberdeen University awarded him an honorary doctorate (LLD) for his contributions to Geology in 1923. He was President of the Edinburgh Geological Society from 1925 to 1927. He resigned from the Royal Society of Edinburgh in 1932.
He died in Glasgow on 15 July 1932.
- Biographical Index of Former Fellows of the Royal Society of Edinburgh 1783–2002 (PDF). The Royal Society of Edinburgh. July 2006. ISBN 0 902 198 84 X.
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