Glacial geomorphology of the Brabazon & Butler Downs, Rangitata Valley, South Island, New Zealand

Rosabella Borsellino, James Shulmeister and Stefan Winkler

Journal of Maps, 2017, vol. 13, issue 2, 502-510

Abstract: The inland valleys of New Zealand’s South Island were heavily glaciated during the last glacial cycle. Subsequent fluvial incision has eroded out glacial deposits from the valleys in many locations, making it difficult to reconstruct glacial dynamics and chronology. The Brabazon and Butler Downs lie in a fault-controlled intra-montaine basin that has been largely protected from fluvial erosion and the area contains extensive evidence for multiple glacial margins. This paper presents a detailed glacial geomorphology map of the Brabazon and Butler Downs at a scale of 1:20,000. Glacial landforms have been mapped and subdivided into three main zones: an upper zone distinguished by a flight of kame terraces, a middle zone containing kettles and meltwater channels, and a lower zone of lateral moraines. The new map provides insight into former glacial environments in the region and provides a related framework for future paleoclimate reconstructions.

Date: 2017
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DOI: 10.1080/17445647.2017.1336122

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