Updated By: LatestGKGS Desk
Geography: Geographical Landform Types, Details, Features
Geography: Geographical landfroms, polycyclic landfroms, terrace formation plateau and valley
A landform created by a number of geographical cycles occurring one after another in an order, leaving their distinct takes on the landscape is called a polycyclic landform.
Old age topography is likely to have superposed upon its Older alluvium terraces like the banger, synclinal ridges, rejuvenated landforms, scarped erosional surface, faultline scarps, uplifted peneplains, palaeomorphic landforms are some of the instances of polycyclic landforms.
A stream may be rejuvenated when land is elevated near its headwater or sea level sinks near its mouth. The streams ability to erode is renewed and downward cutting starts.
The concept of trapped i.e. the step-like landscape emerges out from the basaltic plateau due to solidification of conjugative layers of basaltic material erupting in a fissure mode of volcanic activity such as Deccan plateau.
Polycyclic terrace formation in south Siberian river valley-
Intra-continental river regime and related polycyclic terrace formation have been found in south and central Siberia. The floods which occurred during cold periods followed phases where the river regime was relatively stable.
The simultaneous accumulation of alluvium on terraces of different heights (polycyclic) occurred during the extremely high increase of river level.