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From 1912, Wegener publicly advocated the theory of "continental drift", arguing that all the continents were once joined together in a single landmass and have drifted apart.

In his work, Wegener presented a large amount of very strong

In 1943 George Gaylord Simpson wrote a vehement attack on the theory

evidence in support of continental drift, but the mechanism remained elusive. While his ideas attracted a few early supporters such as Alexander Du Toit from South Africa and Arthur Holmes in England, the hypothesis was generally met with skepticism from largely conservative scientists, who were resistant to any change in the status quo.

but G.G.Simpson's influence was so powerful that even in countries previously sympathetic towards continental drift, like Australia

Wegener's hypothesis fell out of favour.