Stenopterygius
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Stenopterygius is an extinct genus of thunnosaur ichthyosaur known from Europe.
Life restoration of a juvenile Stenopterygius sp.
S. triscissus specimen
1921 restoration by Charles R. Knight
Posidonia Shale
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The Posidonia Shale geologically known as the Sachrang Formation, is an Early Jurassic geological formation of southwestern and northeast Germany, northern Switzerland, northwestern Austria, southern Luxembourg and the Netherlands, including exceptionally well-preserved complete skeletons of fossil marine fish and reptiles.
Posidonia Shale (Posidonienschiefer) Outcrop
Posidonia slate - outcrop of the Black Jura near Hetzles
The former marl pit of Hondelage, NW Germany. At the bottom of the image there is an 8 m long stretch of Posidonia Shale exposed.
Friedrich August von Quenstedt a German Mineralogist who studied the jurassic strata along Germany, including the Black Shales of the Posidonia Shale.