Abstract
Size analysis of the Late Pliocene-Early Pleistocene Upper Siwalik sediments comprising the Pinjor Formation in the type area and adjoining regions reveals that the sediments are bimodal to polymodal in nature, medium to fine grained and are moderately sorted. The inclusive graphic standard deviation and moment standard deviation values suggest the deposition of sediments in shallow to moderately deep fluvial agitated water. The log probability plots reveal that saltation mode is the dominant mode of transportation of detritus. The sediments are continental in character and are derived from crystalline, metamorphic and sedimentary rocks of the Himalaya exposed to the North of the type area Pinjor.
Highlights
Textural analysis or size analysis is the quantitative determination of size frequency distribution
Size analysis of the Late Pliocene-Early Pleistocene Upper Siwalik sediments comprising the Pinjor Formation in the type area and adjoining regions reveals that the sediments are bimodal to polymodal in nature, medium to fine grained and are moderately sorted
The sediments are continental in character and are derived from crystalline, metamorphic and sedimentary rocks of the Himalaya exposed to the North of the type area Pinjor
Summary
Textural analysis or size analysis is the quantitative determination of size frequency distribution. The Siwalik Group is exposed in a linear fashion along the Himalayan foothills for a distance of about 2400 Km. from near Jammu in the West to near Tripura in the East. It represents a huge thickness of sediments ranging from 3300 m to 6300 m [1], which were deposited in a foredeep. The Late Pliocene-Early Pleistocene Pinjor Formation (1.7 Ma - 2.5 Ma) of Upper Siwalik Subgroup is very well exposed in the type area Pinjor and surrounding regions (Figure 1). The Lower Siwalik/Nahan Formation represents the first mega cycle It recorded a slow pace of erosion and sedimentation and stable paleotectonic conditions. The sedimentology of the Siwalik Group has been examined by [1,3,4,5,6,7,8,9,10,11] and others
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