What is the Frankfurt rock?

Frankfurt rock is the second soil layer under the Frankfurt clay, which is present in the inner city usually not close to the surface of the earth. The Frankfurt rock consist of layers of limestones and are sometimes also called Frankfurt deep rocks.The soil layer Frankfurt rock plays an important role in foundation of high-rise

What is the Frankfurt clay?

If you consider that Frankfurt is the only city in Germany boasting a skyscraper skyline, you might expect the ground under this European metropolis to be ideal for high buildings. But that is not the case; the ground there is predominantly clay.Clay has many disadvantages for high-rise construction. Described in technical jargon as "cohesive soils",