These folds are characteristic of a-type fold which are commonly found in ductile shear zones.
这些褶皱的特征表明它们属于a型褶皱，而a型褶皱通常发育在韧性剪切带中。
A third type of mountain may be formed as a result of volcanic activity which occurs in regions of active fold mountain belts, such as in the Cascade Range of western North America.
第三种类型的山可能是由于火山活动形成的，一般发生在活动性褶皱带地区，如北美西部的喀斯喀特山脉。
A third type of mountain may be formed as aresult of volcanic activity which occurs in regions of active fold mountain belts, such as in the Cascade Range of western North America.
第三种类型的山脉可能由于火山活动而形成，火山活动发生在活跃的褶皱山脉带上，如北美洲西部的喀斯特山脉。
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