trim line
{{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}}
File:Vihren, Pirin National Park 01.JPG 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.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