POLYGON FEATURES
Surficial geology polygon attributes include Unit_sym and Label.
Unit_sym is a text, map symbol for the genetic class and provides a generalized code used to colour code the polygon units. Genetic classes include the following:
LGL - Littoral and nearshore sediments E - Eolian deposits O - Organic deposits FG - Glaciofluvial deposits FGI - Ice contact sediments C - Colluvial deposits F - Fluvial deposits MF - Fluted moraine MS - Stagnant ice moraine M - Moraine MU - Undifferentiated moraine MT - Ice thrust moraine LG - Glaciolacustrine deposit L - Lacustrine deposit R - Bedrock OF - Fen peat OB - Bog peat FP - Preglacial fluvial deposit RT - Fluvial gravels
Label (e.g. gFGIr) is a text code that symbolizes terrain units. The first letter (if present) represents a textural modifier indicating that the unit differs from the typical description of the unit. Textural characteristics may be applied to the terrain classification as a prefix based on field observations or by inference from distinctive genesis and/or morphology. When two modifiers are given, the second letter is the dominant texture, with the first letter indicating the secondary texture, i.e., sc for sandy clay.
p = pebble g = gravel s = sand $ = silt c = clay a = sand-silt-clay
The capitalized letters represent the genetic class. The lower case letter(s) following the genetic class represent the geomorphic modifier(s) of the unit.
Where two or more classes of terrain are interspersed in a mosaic or repeating pattern on a scale too small to warrant meaningful differentiation, the proportion of each component in the combination is given in a two or three position designation set off by slashes denoting arbitrary percentage limits. For example, 'Mp/LGv' means that the area is underlain by approximately 60% morainal plain and up to 40% glaciolacustine veneer.
Where materials of different origin or texture are known to be superimposed or can be confidently inferred, the sequence is indicated in conventional order using vertical separators. For example, 'sLGv | Mp' represents thin sandy glaciolacustrine sediment deposited on morainal plain.
Locally, two or more terrain units are juxtaposed by reason of related origin, temporal sequence, or ambiguous geomorphic distinction. In the last case, both components may or may not be present. Such situations are identified by a compound designation marked by a hyphen. Examples are: 'FGz-LGz' indicating ice-contact delta indistinguishable from glaciolacustrine delta, or 'FGlk-MSh' indicating ice-contact kame and kettle topography that blends with hummocky stagnant ice moraine.
Where a sequence of geomorphic processes has produced a multi-aspect or compound terrain fabric, the geomorphic modifier suffixes are appended in the inferred order of super position. 'Mpry' means that a plain of till has been moulded into ridge forms and finally dissected by modern streams. 'FGphr' means that a glaciofluvial plain has been discontinuously covered by ice-contact hummocks and ridges.