6 · Canada
Banff and Jasper National Parks
Turquoise lakes and great mountain roads through the Canadian Rockies.
The wonder encyclopaedia · Earth and nature
Glacial valley
A valley whose form has been substantially altered by moving ice and the rock carried within it.
Photograph
Gorgo · Public domainA way of understanding.
A glacier is moving ice, and the material it carries helps abrade and reshape the ground. Broad valley floors, steep sides, hanging tributary valleys and deposits of debris can remain after much of the ice has disappeared. Not every feature in a mountain valley has the same origin or age.
Look across a whole valley before looking up at an individual summit. The shape of the cross-section, the position of waterfalls and the location of ridges of loose material may help explain the scene. Interpretation is especially rewarding where current glaciers occupy only part of a formerly larger glaciated landscape.
The visitor's photograph captures a moment in a changing system. Ice fronts, lakes and access routes can change, so use current local guidance rather than treating a historic picture as evidence of today's conditions.
A question to take with you
Which features make more sense if you imagine the valley partly occupied by moving ice?
Further explanation and context: www.nps.gov. The examples below are editorial connections, not a claim that every place has an identical history or form.
See the idea in the world.
Patagonia & Perito Moreno Glacier
Granite peaks, wind-shaped country and the blue edge of an icefield.
101 · United States
Yosemite National Park
Granite walls, falling water and a valley on a monumental scale.
306 · New Zealand
Aoraki / Mount Cook
Alpine peaks, glaciers and valley perspectives make the structure of New Zealand's high mountain landscape unusually clear.
311 · Peru
Huascarán and the Cordillera Blanca
Tropical glaciers, sharp peaks and high lakes make an exceptional mountain landscape where altitude shapes every visit.