The sand hall is located in the dolomite of the white jurassic limestone at a depth of 25 m.
As a compound of calcium carbonate and magnesium carbonate it is quite porous, as can be seen distinctly in the ceiling of the hall.
The sand hall is located in the dolomite of the white jurassic limestone at a depth of 25 m.
As a compound of calcium carbonate and magnesium carbonate it is quite porous, as can be seen distinctly in the ceiling of the hall.
Beneath a depth of 28 m the rock appears more compact. Here, the dolomite gives way to pure jurassic limestone, i.e. pure calcium carbonate.
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