Highstand Systems Tract(HST) which bottom is marked by the emergence of condensed sectionand top is a maximal flooding surfaceformed during the period from the ascent inflexion point(R)to the highest point(H) of lacustrine level change.

• 高水位体系域形成于湖平面上升拐点R至最高点H时间段，其底以凝缩段出现为界，顶以最大湖泛面为界；