Low bottom and ochre

Ochre potential areas are designated low-bottom areas, some of which are mapped for sulphur acidity (pyrite content).

The database was created in connection with ochre mapping 1981-84. 5, 6, 7, 8. This study was carried out in accordance with Act No 57 of 18 February 1981, according to which a survey of potentially sulfur acidic soils in Jutland was to be carried out. On the basis of the low-bottom areas, approximately 8000 boreholes have been selected in low-bottom areas in Jutland.

In terms of ochre, the low bottom areas are divided into the following classes:

Class I > 50 % of profiles contain highly acidified samples

Class II 20-50 % of profiles contain highly acidified samples

Class III < 20 % of profiles contain highly acidified samples

Class IV no acidified samples

Class V not classified