杜。托伊特提出古生代不只一个而是有两个联合古陆，即北半球的劳亚古陆和南半球的冈瓦纳古陆，其间为特提斯海分开MRS。
Paleozoic Toit made more than one but two joint ancient land, that is, the Northern Hemisphere land Laurasia and Gondwana ancient land of the southern hemisphere, which is separated from Tethys.
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