{{short description|Clear line on the side of a valley marking the most recent highest extent of the glacier}} {{for|the variety of telephone set|Trimline}} {{distinguish|Line trim}} thumb|A trim line marks the previous height of Tana Glacier in Alaska [[File:Vihren, Pirin National Park 01.JPG|thumb|A trim line on Vihren peak, Pirin Mountain, Bulgaria]] A '''trim line''', also written as '''trimline''', is a clear line on the side of a valley formed by a glacier. The line marks the most recent highest extent of the glacier. The line may be visible due to changes in color to the rock or to changes in vegetation on either side of the line.
The term "trim line" is also used for similar looking phenomena caused by floods, volcanic activity, or tsunamis.<ref name="Dutch">Steven Dutch, [http://www.uwsp.edu/geo/projects/geoweb/participants/Dutch/LituyaBay/Lituya4.HTM Giant Waves in Lituya Bay, Alaska] {{webarchive|url=https://web.archive.org/web/20070616141506/http://www.uwsp.edu/geo/projects/geoweb/participants/Dutch/LituyaBay/Lituya4.HTM |date=2007-06-16 }} USGS PP 354-C</ref>
==References== {{Reflist}}
{{Glaciology-stub}}
Category:Glaciers