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Natural Resources Canada > Earth Sciences Sector > Priorities > Geoscape Canada > Fort Fraser
Geoscape Fort Fraser Table 1. Earth material characteristics
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| Map unit |
Material |
Thickness |
Permeability |
Erodability |
Stability |
Aquifer
potential |
Water
quality |
pH buffering
potential |
Aggregate
potential |
Morphology |
| Peat deposits |
Peat |
1-3 m |
Low to high |
Low |
Low |
Low |
Low |
Low |
nil |
Flat |
| River sediments |
Sand, gravel, slit |
2-10 m |
High |
Variable |
Medium |
Medium |
Medium to high |
Low |
Medium to high |
Flat (floodplain, terrace) |
| Landslide debris |
Diamicton, rubble, silt |
1-5 m |
Medium |
Low to high |
Low |
Low |
n/a |
Low |
Low |
Hummocky |
| Slope sediments |
Diamicton, sand, gravel |
1-5 m |
Medium |
Variable |
Medium |
Low |
n/a |
Low |
Variable |
Inclined, rolling |
| Glacial lake sediments |
Silt, clayey silt, fine sand |
1-30 m |
Low to medium |
High |
Low |
Low to moderate |
High |
Medium |
Low |
Flat, rolling, gullied |
| Glacial river sediments |
Sand, gravel |
1-10 m |
High |
Medium |
Medium |
High |
High |
Low |
High |
Flat, hummocky |
| Glacial till |
Diamicton |
1-10 m |
Low |
Low |
High |
Low |
na |
Low, except in northeast |
Low |
Rolling |
| Sedimentary rocks |
Sandstone |
n/a |
Low |
Low |
High |
Low |
n/a |
Low |
Low |
Hilly, mountainous |
| Limestone |
Limestone |
n/a |
Medium |
Low |
High |
Medium |
Medium |
High |
Medium |
Hilly, mountainous |
| Felsic volcanic rocks |
Rayolite, dacite |
n/a |
Low |
Low |
High |
Low |
n/a |
Low |
Rhyolite medium |
Hilly |
| Mafic volcanic rocks |
Basalt |
n/a |
Low |
Low |
High |
Low |
n/a |
Low |
High |
Hilly, mountainous |
| Felsic plutonic rocks |
Granite, diorite |
n/a |
Low |
Low |
High |
Low |
n/a |
Low |
Low |
Hilly, mountainous |
| Mafic plutonic rocks |
Gabbro, ultramafite |
n/a |
Low |
Low |
High |
Lo |
n/a |
Low |
Ultramafic moderate |
Hilly, mountainous |
|
