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Dominating soil parent material class
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17/3/2006

Dominerande jordartsklass

Map showing greatest dominant class for soil parent material inside a certain area, as well as strengthen of dominance. Consequently dark shade mark strong dominance in respective class

The unconsolidated soil layer is according to the way it was formed, classified into different soil parent materials. Soil parent material is assessed in the dug trial pit at the same depth as for the assessment of texture (variable Texture).

Soil parent material is classified according to:

Code

Soil parent material

(1)

Sediment with high degree of sorting (gyttja included)

(2)

Sediment with low degree of sorting

(3)

Till

(4)

Bedrock outcrop

(5)

Peat

 

The unconsolidated soil layer (regolith) is according to the way it was formed, classified into different types of parent material for soil formation. Type of parent material is assessed in the dug trial pit at the same depth as for the assessment of texture (variable Texture).

Code

Sediment/Till/Others

       

(0)

-/-/Boulders in the pit

       

(1)

Shingle and stone/Boulder rich and stony/Bedrock outcrop

 

>

20

mm

(2)

Gravel/Gravelly /-

20

-

2

mm

(3)

Coarse-grained sand/Sandy/-

2

-

0.6

mm

(4)

Medium-grained sand/Sandy fine sandy/-

0.6

-

0.2

mm

(5)

Fine sand/Sandy fine sandy /-

0.2

-

0.06

mm

(6)

Coarse silt/Coarse silty/-

0.06

-

0.02

mm

(7)

Fine silt/Fine silty/-

0.02

-

0.002

mm

(8)

Clay/Clayey/Gyttja

<

0.002

mm

(9)

-/-/Peat

       

Maps were produced by merging and combining classes for Soil parent material and texture according to the following:

Class

Soil parent material

Texture

Fine-grained tills

(3) Till

(6) coarse silty
(7) fine silty
(8) clayey

Medium-grained tills

(3) Till

(4) sandy fine sandy
(5) sandy fine sandy

Coarse-grained tills

(3) Till

(0) boulders in pit
(1) boulder rich and stony
(2) gravelly
(3) sandy

Fine-grained sediments

(1) Sediment with high degree of sorting
(2) Sediment with low degree of sorting

(6) coarse silt
(7) fine silt
(8) clay

Medium-grained sediments

(1) Sediment with high degree of sorting
(2) Sediment with low degree of sorting

(4) middle grained sand
(5) fine sand

Coarse-grained sediments

(1) Sediment with high degree of sorting
(2) Sediment with low degree of sorting

(1) boulder rich
(2) gravel
(3) coarse-grained sand

Bedrock outcrop

(4) Bedrock outcrop

Peat

(5) Peat

 

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