The alluvial plain resulted from the filling up of one slanting compartment of the crystalline Basement.
In addition, during progradation, there was also an autogenic increase in sediment storage on the coastal plain, resulting in a gradual autoretreat of the depositional system.
Due to multiple bursts and river diversions, various types of sediment was repeatedly accumulated in the different landform parts of the plain, resulting in sharp differences in texture of the same soil layer (NSSO 1998).
From visual inspection of the failure sites and a detailed geotechnical investigation of soil from 24 nearby boreholes, it seemed that the failures caused primarily due to inadequate resistance from the soft soil of Indo-Gangetic plain, resulting bearing and overturning failures.
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Abyssal plains result from the blanketing of an originally uneven surface of oceanic crust by fine-grained sediments, mainly clay and silt.
The gravel plains resulted from deposits left during the Pleistocene Epoch (about 2,600,000 to 11,700 years ago) by ancient river systems now represented by such wadis as Al-Rimah Al-Bāṭin, Al-Rimah Al-Bāṭinwāsir-JAl-Rimah Al-Bāṭind vast loads of sediment from the interior toward the PersiandGulf.
The eastward increase in precipitation across the Ganga Plains results in rivers with low stream power and a very high sediment flux, resulting in an aggradational mode and little incision.
The flat appearance of mature abyssal plains results from the blanketing of this originally uneven surface of oceanic crust by fine-grained sediments, mainly clay and silt.
This is due to the wide range of sediment permeability that occurs in the coastal plain may result in the incomplete flushing of the relict salinity.
