The basin tectonic model: it is intermont basin during late Jurassic to early Cretaceous, developed into faulted-lacustrine basin in Eogene, and evolved into depression in Neogene and Quaternary.
“盆地”构造发育模式为:从晚侏

白垩
末期发育的山间“盆地”开始、发展
早
三
断陷湖盆的发育、再演化为晚
三
及

地陷发育阶段。
位置
群山(上)
山谷;在这里,一条河流

。



