In the last million years, during cold glacial periods, many of the valleys in South Westland were filled by glaciers. This aerial photograph shows lateral moraine ridges, formed at the margins of a glacier, in the lower Cascade valley. At present the river (upper left) meanders along a broad, swampy valley, formed after the glacier melted about 12,000 years ago.
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GNS Science
Reference:
CN10241/18
Photograph by Lloyd Homer
Permission of GNS Science must be obtained before any use of this image.
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