distinguish between old fold mountain and young fold mountain
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Young Mountain Belts are less than 100 million years old). These are belts of high, fold mountains and valleys, major fault-block ranges, rift valleys, volcanic mountain complexes and island arcs, all arranged in sub parallel chains of mountains (cordilleran belts), provide structural landform of moderate to great relief, slope and irregularities, commonly in linear arrangements.
Old Mountain Belts are 100 to 500 million years old. These are former cordilleran belts now upraised or exhumed by block faulting, epeirogenic uplift, or tilting and accentuated by fresh volcanism. Further relief and many characteristic features are provided by acceleration of erosional agents, strongly controlled by fracture and joint patterns, differential erosion, and intrusive volcanics. They provide structural landform of low to moderate relief, slope and irregularity, commonly of linear or geometric arrangement.
Old Mountain Belts are 100 to 500 million years old. These are former cordilleran belts now upraised or exhumed by block faulting, epeirogenic uplift, or tilting and accentuated by fresh volcanism. Further relief and many characteristic features are provided by acceleration of erosional agents, strongly controlled by fracture and joint patterns, differential erosion, and intrusive volcanics. They provide structural landform of low to moderate relief, slope and irregularity, commonly of linear or geometric arrangement.
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