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| Ministry of Environment |
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| Terrain |
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Granular Resources
Terrain maps can be used to identify materials that are potential sources of construction and road aggregate and fill. The following table provides a guide to the identification of appropriate terrain units, such as are shown on the map below. A colour-coded terrain map can then be used as a guide to detailed field investigation of granular resources or for rough planning of road layout. Hatched tones on the map indicate terrain units that are only partially made up of potential granular resources.
Character of Granular Resources |
Terrain Symbol * |
Landform |
Generally good
sources of
aggregate |
Ft
Ff
FGr
FGI, FGp |
river terrace
fan or delta
esker
outwash plain |
Possibly good sources
of aggregate, but
character of material
is variable |
FGh
FGt, FGt-H
Wt
Wm, Wj |
kame
kame terrace
beach terrace
beach |
Material suitable for
aggregate but subject
to flooding |
FAI, FAp
FAf
FAt |
floodplain
fan, delta
low terrace |
Possible subgrade
material |
Cf, Ca, Cc
Cf-A, Ca-A
Cc-A
Cf |
talus slopes
avalanche
cones and fans
colluvial fans |
*See specific symbols on terrain maps for further information about texture.
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