The Marginal Ganga Plain (MGP) exhibits up to 160 m thick fluvial sedimentary record of the Late Quaternary forebulge dynamics. The mineralogical composition of sediments from forty boreholes reveals three major depositional sequences (DS1, DS2, and DS3) and four sequence boundaries Sb1, Sb2, Sb3 and Sb4 representing where different tectonic and climatic conditions exercised parental control. These sequence boundaries are demarcated by the shift in facies architecture. The Sb1 sequence boundary is locally developed over the basement rocks. The lowermost DS1 represents a thick floodplain and low sinuosity channel association at > 114 ka under stable landscape. This DS1 indicates a low rate of sedimentation and High Accommodation Systems Tract (HAST), characterized by positive > 1 A/S (Accommodation to Sediment) ratio. The sequence boundary Sb2 lies between DS1 and overlying DS2 implies a regional unconformity in the MGP and negative A/S ratio. Further, laterally extensive asymmetrical DS2, developed between ~ 80–54 ka with an erosional base overlies the DS1 and represents Low Accommodation Systems Tract (LAST) with A/S < 1. The Sb3, present between DS2 and DS3 denotes a sharp transition in facies architecture. The DS3 made up of the interfluves sequence shows an upward fining sequence deposited by vertically aggrading minor channels developed after 54 ka and is characterized as HAST where A/S > 1. The Sb4 represents the top surface of the DS3 and is currently getting degraded by ravinement processes. The varying pattern of alluvial architecture in the MGP defines variable A/S ratio and infer forebulge tectonic signature shaping the fluvial landscape.

边缘恒河平原 (MGP) 展示了晚第四纪前隆起动力学的高达 160 m 厚的河流沉积记录。四十个钻孔沉积物的矿物组成揭示了三个主要沉积层序（DS1、DS2 和 DS3）和四个层序边界 Sb1、Sb2、Sb3 和 Sb4，代表不同构造和气候条件行使亲代控制的地方。这些层序边界由相结构的转变划分。Sb1 层序边界局部发育在基底岩石上。最下方的 DS1 代表在稳定景观下 > 114 ka 的厚泛滥平原和低曲折的河道组合。此 DS1 表示低沉降率和高调节系统区域 (HAST)，特征为正值 > 1 A/S（调节与沉积物）比。层序边界 Sb2 位于 DS1 和上覆 DS2 之间，这意味着 MGP 中存在区域不整合和负 A/S 比。此外，横向广泛的不对称 DS2，在 ~ 80-54 ka 之间发展，侵蚀基底覆盖在 DS1 上，代表 A/S < 1 的低调节系统道 (LAST)。存在于 DS2 和 DS3 之间的 Sb3 表示在相结构。由间流序列组成的 DS3 显示出向上细化序列，由 54 ka 后形成的垂直加积小通道沉积，特征为 HAST，其中 A/S > 1。Sb4 代表 DS3 的顶面，目前正在退化开垦过程。MGP 中冲积结构的不同模式定义了可变的 A/S 比并推断形成河流景观的前隆起构造特征。