Fascinating layers of time are etched into this very spot at the Grenzdolomit in der Apfelstädt. We are standing at the Grenzdolomit. It is located in the riverbed of the Apfelstädt stream. This geotope marks a significant geological boundary.
The Grenzdolomit in der Apfelstädt is not just any rock formation. It is a striking “Leithorizont”. This formation defines the boundary between the Lower and Middle Keuper. This was roughly 230 million years ago. Hence, the name Grenzdolomit or border dolomite.
Picture this. The Grenzdolomit is a compact dolomite sequence. It measures two to four meters thick. Thin mudstone layers are also present. The sandy marls and gypsum-rich mudstones erode easily. However, the dolomite beds are very resistant. This creates a natural step in the Apfelstädt stream bed.
The Grenzdolomit is a marine deposit. Marine fossils are enclosed within it. The most common fossil is the mussel Costatoria goldfussi. Fish scales and bones are also found here. Rarely, one might find cephalopod remains like Germanonautilus.
Consider the ancient sea. It teemed with life. Creatures swam and thrived. Their remains became part of the rock. This story is etched in stone at the Grenzdolomit.
Our location is special for another reason. The Grenzdolomit in der Apfelstädt is on the Apfelstädt Jacobsweg Tour. Look for the Mill Trail info panel nearby. You will find an explanation of the Grenzdolomit on its back. Take a moment to read it later.
Imagine holding a fossil. It was once a living creature. It swam in these waters millions of years ago. This connection to the past is what makes the Grenzdolomit so special.
We are standing at a place where time and nature meet. The Grenzdolomit in der Apfelstädt tells a story. It is a story of ancient seas. It is a story of geological change. It is a story of life itself. As we continue our tour, remember this place. Remember the Grenzdolomit. Remember the deep history beneath our feet.