这是摘要
To overcome inconsistencies in the Exxon sequence stratigraphic model as applied to silicielastic and carbonate shelf margins, it is proposed that an ideal sequence should consist of four systems tracts. In addition to the transgressive and highstand systems tracts, developed during rising base-level, it is suggested that there should be two systems tracts associated with falling and lowstands of relative sea-level. These are: the forced regressive wedge systems tract formed during falling base-level, bounded below by the ‘basal surface of forced regression’ and above by the sequence boundary, representing the lowest point of sea-level fall, and the lowstand prograding wedge systems tract, developed as relative sea-level begins to rise after sequence boundary formation. This systems tract downlaps the basin-floor forced regression deposits in a basinwards direction and onlaps forced regressive wedge sediments on the slope. The forced regressive wedge systems tract consists of shallow-water stranded parasequences deposited on the upper slope to the shelf, and basin-floor fan or apron sediments, deposited at the toe-of-slope and derived from erosion of the stranded parasequences and/or erosion of the previous highstand shelf and shelf-margin sediments.
根据摘要，我觉得应该翻译Stranded parasequences and the forced regressive wedge systems tract: deposition during base-level'fall为：基准面下降时沉积形成的叠合的准层序和强水退楔状体系域。
【注】：基准面下降时沉积的两种体系域：the forced regressive wedge systems tract（强水退楔状体系域） 和the lowstand prograding wedge systems tract（水退推进楔状体系域）。
不一定准确哈，望见谅!
