Mechanical Analyses of Middle Siwalik Sandstones from Ramnagar, Nainital District, Kumaon Himalaya

Studies have been carried out on the size characteristics of Middle-Siwalik sandstones collected from the tract lying between Ramnagar and Kalagarh with a view to interpret the environment of deposition. Statistical parameters have been obtained from the weight frequencies recorded from the mechanical analyses of these sediments. Analysis on the Wentworth's size classification reveals that the sediments are composed essentially of fine and very fine sands, the former being predominant. It is seen that the coarser fraction behaves differently from the rest of the sediments and has been incorporated in response to fluctuations within the tectonic framework. Overall conditions of sedimentation remained more or less similar.