Hunsrück Slate, Germany

The Hunsrück Slate, found in southwestern Germany, is a rock formation famous for offering a glimpse into life during the Devonian period, roughly 400 million years ago.

Here’s a breakdown of its key aspects:

Age and Formation:

  • Deposited in the early Devonian period, specifically the Lower Devonian epoch.
  • Formed from the sediments of an ancient, shallow sea called the Lizard-Giessen-Harz/Rheno-Hercynian Ocean.
  • These sediments originated from the erosion of a landmass called the Old Red Sandstone Continent.

Unique Feature: Exceptional Fossil Preservation:

  • Classified as a “Lagerstätte,” meaning it contains exceptionally well-preserved fossils.
  • This remarkable preservation is attributed to rapid burial by sediments, preventing decomposition and protecting delicate soft tissues.
  • The fossils showcase a diverse range of marine life, including:
    • Invertebrates like trilobites, brachiopods, and echinoderms.
    • Early fish species.
    • Even rare plant fossils.


  • The Hunsrück Slate is a valuable resource for paleontologists, offering insights into the biodiversity and ecological conditions of the Devonian period.
  • Its exceptionally preserved fossils have contributed significantly to our understanding of the evolution of marine life during this crucial time in Earth’s history.
  • While slate mining in the region has mostly ceased, the legacy of the Hunsrück Slate lives on through the numerous fossil collections housed in museums worldwide, offering a window into this ancient world.