Moraine
glacially formed accumulation of unconsolidated glacial debris
A moraine is any accumulation of unconsolidated debris (regolith and rock), sometimes referred to as glacial till, that occurs in both currently and formerly glaciated regions and that has been previously carried along by a glacier or ice sheet. It may consist of partly rounded particles ranging in size from boulders (in which case it is often referred to as boulder clay) down to gravel and sand, in a groundmass of finely divided clayey material sometimes called glacial flour. Lateral moraines are those formed at the side of the ice flow, and terminal moraines are those formed at the foot, marking the maximum advance of the glacier. Other types include ground moraines (till-covered areas forming sheets on flat or irregular topography) and medial moraines (formed where two glaciers meet).
Etymology
The word moraine is borrowed from French moraine [mɔ.ʁɛn], which in turn is derived from the Savoyard Italian morena ('mound of earth'). Morena in this case was derived from Provençal morre ('snout'), itself from Vulgar Latin *murrum ('rounded object'). The term was introduced into geology by Horace Bénédict de Saussure in 1779.
Characteristics
Moraines are landforms composed of glacial till deposited primarily by glacial ice. Glacial till is unstratified and unsorted debris ranging in size from silt-sized glacial flour to large boulders. The individual rock fragments are typically sub-angular to rounded in shape.
The public source identifies “Moraine” as glacially formed accumulation of unconsolidated glacial debris. This brief keeps that definition visible, then builds a research path around Moraine, glacially and formed.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 17, 2026. The linked authority identifier is Q2610088. The Library of Congress control number is sh85087196. 1 of 1 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 1779.
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This entry incorporates text from “Moraine” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.