Millions of years old stones

The photographed stones are millions of years old. They came to the Netherlands with the rivers from the southern and eastern countries or during the Saale ice age with the glaciers from Scandinavia. The stones have acquired a very beautiful appearance over time. Often there is a lot to discover in it, can be a face or a beautiful line formation and whatever you want to see in it. I found these stones in or near the river IJssel in the Netherlands.