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Dominating soil parent material class
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17/3/2006

Frequency of soil parent material class fine-grained sediment

Frequency map showing share of forested area consisting of soil parent material class fine-grained sediment

 

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).

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

 

Soil textural classes describe grain size distribution in the mineral soil, and in the first place refer to the dominating grain size within the fraction with a diameter < 20 mm (quadratic mesh).

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. Bold letters here indicate dominance of this fraction:

Class

Soil parent material

Texture

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

 

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