冰斗是一种三面环以峭壁、呈半圆形剧场形状或圆椅状的洼地。雪线附近山坡下凹部分多年积雪斑边缘的岩石因冻融作用频繁而崩坍为岩屑，并在重力作用与融雪径流共同作用下搬运到低处，使积雪斑后缘、雪斑下的地面则逐渐蚀低成为洼地即雪蚀洼地。积雪演化为冰川冰后，冰川对底床的刨蚀作用使洼地加深，并在前方造成坡向相反的岩槛，同时后缘陡壁受冰川刨蚀作用而后退变高，从而形成冰斗。
冰川类型为宽尾山谷冰川、山谷冰川和冰斗冰川；
During the last glaciation, the glacier types were wide-tail valley glacier, valley glacier and cirque glacier;
冰碛物组成的终碛垅，代表了在冰川发育的不同阶段冰斗冰川下达的空间位置。
On composing of glacial drifts, the terminal moraines represent the space positions which the cirques glaciers reached on the various stages of the development of glaciation.
除了被迷你汪卡湖占据的弓河谷外，冰川作用的证据还可以在南部的圆形冰斗处找到。
Besides the Bow Valley, evidence of glaciation also appears in this image south of the lake, in the amphitheater-shaped cirque.
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