Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

R. S. Chaudhri ¹, G. S. Gill ¹

Affiliations
1 Centre of Advanced Study in Geology, Panjab University Chandigarh-160014, IN

Abstract

The megaclast representing boulder, cobble and pebble sized fragments was derived from the Tertiary formations exposed immediately northeast of Pinjaur along the course of the Koshallia River. The detritus did not travel far from the source rocks and was transported by southwesterly flowing currents. The megaclast was deposited in shallow turbulent water where it could acquire well sorted to moderately sorted character.

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Ravindra Kumar ¹, G. S. Gill ¹, L. N. Gupta ¹

Affiliations
1 Centre of Advanced Study in Geology, Panjab University, Chandigarh - 160 014, IN

Abstract

Soft sediment deformational structures have been observed in three sections of the basal Pinjor Formation exposed in the frontal Himalayan foothills in northern Haryana. The Nadah Choe section (A) shows contortion, Thinning-Thickening and faulting within 5 m thick sequence of sandstone, sandy shale and calcareous siltstone. The section (B) in a stream in the southwest of Nadah shows autoclasts, contortions around clay ball and faulting about 2 m thick Fluvio-Lacustrine sequence. The third section © is exposed in the Ghaggar river shows diapiric, Flame-Like intrusion of mud into the overlying beds of siltstone. The three sections are about 1.5 km strike length of gently dipping beds of basal Pinjor Formation. These structures were formed by liquefaction attending shear stress and can be related to major seismic events in this region during the deposition of the basal Pinjor Formation.

Keywords

Earthquakes, Pinjor Formation, Nadah, Haryana.

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