Abstract
Mountain belts are constituted of thick prisms of tectonized sediments. The concept of geosyncline was originally created as an explanation of the tectonized sediments and how they were formed and deformed into the mountain ranges. In so far as the sediments are deformed into the mountain ranges, the original trough or trough-ridge complex (where the sediments occur) are geosynclines. Such an authentic concept of geosyncline has been seriously misunderstood. The present contribution attemps to discuss the two misinterpreted cases byDott (1974), i. e. island arc as evidence of orogenesis without thick sediments and thick continental-rise sediments are not destined to deform into the mountain range, as against the geosyncline theory. With clearance of this confusion, the authentic concept of geosyncline is further emphasized and designated as the orogenic concept of geosyncline.
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