Paleobiota of the Posidonia Shale

The Sachrang Formation or "Posidonienschiefer" Formation (common name the "Posidonia Shale") is a geological formation of southwestern Germany, northern Switzerland, northwestern Austria, southeast Luxembourg and the Netherlands, that spans about 3 million years during the Early Jurassic period (early Toarcian stage). It is known for its detailed fossils, especially marine biota, listed below.

Source: Wikipedia — Paleobiota of the Posidonia Shale (CC BY-SA 4.0)