Antecedent River

•River that maintains its original course and pattern despite the changes in underlying rock topography.
Examples
Indus, Sutlej, Ganga, Brahmaptra, Subansiri, Kosi.
•Superposed River
River that forms over horizontal beds that overlie folded and faulted rock with varying resistance.
Examples
Chambal, Damoder, Subarnrekha, Banas