I live in Switzerland and my house is build on a rock, some of the foundation is actually rock and not concrete but it's old from 1750. So that drilling techniq

I live in Switzerland and my house is build on a rock, some of the foundation is actually rock and not concrete but it's old from 1750. So that drilling technique is not for my yard. But, this lead me to think, is non rock ground frequent in urbanized area? Is rock ground like my place more like the exception? I'm used to it so I thought it was the norm, but I guess it is not.