distinguish between old fold mountain and young fold mountain
The Fold Mountains are of two types:
The Block Mountains have a steep and small slope towards the rift valley but the slope on the other side is long and gentle. The layers of the mountain are parallel to the gentler slope. There are many block mountains in Oregon (U.S.A.) whose crest line has not been much deformed by erosion. The Block Mountains of Nevada and Utah have been eroded down.
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