Erratic Blocks and Other Quaternary Symbols

Symbols in the “Erratic Blocks” section are used to represent field information relating to erratic blocks and glacial dispersal studies. “Quaternary symbols” relate to sites where information has been collected in the field. They are expressed on maps of surficial deposits as a dot and are superimposed on morphosedimentological zones.

The list of symbols is also available in PDF format.

Erratic Blocks

Other Quaternary Symbols

↑ Exotic boulder (>256 mm in diameter) that was removed during deglaciation and transported mainly by glacial processesErratic block transported by alluvial, lake or sea ice or icebergs. These boulders are typically found in the vicinity of water bodies or major rivers where they form a ridge, reaching up to a few metres highErratic block whose chemical composition or lithological nature is indicative of mineralizationSite where a thematic study has been carried out (e.g. a till fabric, a petrographic count, etc.)Swarm of blocks aligned according to the orientation of ice flowSwarm of blocks containing several indicators of the same geological context and aligned according to the orientation of ice flowDated siteSite where a sample of the secondary environment (glacial, fluvioglacial, lake bottom or stream sediment, etc.) has been collectedSite where observations on glacial erosion marks are gatheredSite where information has been collected in the field