Several basin-and-range systems of foreland-type were developed in Indosinian-Yanshanian in South China

and they became "a composite basin-and-range system" through mutual influence

interference and superimposition.Based on detailed analysis of the Upper Yangtze composite basin-and-range system

it is believed that the composite basin-and-range system has been formed through the closing of Paleotethys archipelagic ocean

the convergence and collision of multiple blocks and orogeny.The researches reveal that in the long-term evolution of basin-and-range coupling and composite evolution since Indosinian

Longmen Mountain

Daba Mountain

Jiangnan uplifted tectonic zone and their foreland basins have not only led to the formation of several composite basin-and-range systems but have also led to the final formation of the huge composite basin-and-range system with "three mountains and one basin"

i.e.Longmen-Daba-Jiangnan uplift composite basin-and-range system

also called the Upper Yangtze composite basin-and-range system for short.After Indosinian-Early Yanshanian

the Upper Yangtze composite basin-and-range system

together with the other composite basin-and-range systems in South China

have entirely been reformed and finally resulted in the present complicated basin-and-range structures and appearances.