Baiyinchagan depression is part of downwarping faulted rift basin developed on XingmengHercynian multicycle and collision fold basement in late Mesozoic.
The area had undergone such evolution stages as passive borderland basining, squeerze-retrograde nose-like swelling, cratonic inner sagging. intracratonic basining and para-foreland basin.
The incidence of umbilicated indentation in astrocytoma, cerebral metastases and brain abscess was nearly the same, showing no value in qualitative diagnosis.
Calcification, air-bronchogram, cavity and pleural indentation of the lesion in the peripheral lung cancer were better displayed by spiral than by conventional CT.
Nonsandstone reservoirs between salt beds of Qianjiang Formation in the Qianjiang Sag of the Jianghan Basin are mainly composed of dolomicrite,glauberite rock,mudstone and their peperite.
Dongpu depression, a oil-gas bearing basin, is situated in the southwest Bohaiwan basin.Puwei sag is a subunit that is tectonically located in the north central upheave of Dongpu depression.