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Proto-Tethys Ocean
The Proto-Tethys Ocean was an ancient ocean that existed from the latest Ediacaran to the Carboniferous (550–330 Ma).
==History of concept==
The name "Proto-Tethys" have been used inconsistently for several concepts for a supposed predecessor of the Paleo-Tethys Ocean, a palaeocean that separated the margins of Gondwana, often referred to as peri-Gondwana, from various continents and Gondwana-derived continental fragments from Precambrian times and onwards.
According to , after the Cadomian orogenic events 550 Ma, the Proto-Tethys Ocean formed the eastern part of an oceanic domain (of which the Iapetus and Tornquist oceans formed the western parts) which subducted under the northern margins of Gondwana. In this model the Proto-Tethys separated the North China and Baltica continents from Gondwana. In the Early Ordovician 500-480 Ma, the Proto-Tethys was subducted under Cadomia as a result of the Chamrousse back-arc basin. used the name 'Ran Ocean' for a similar concept, the Cambrian-Ordovician ocean that separated Baltica from Gondwana.
Other geologists dispute the existence of such an ocean.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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