Hettangian [SEP] creator
lower Lias from the Northern Limestone Alps where well-preserved but very rare ammonites, including Alsatites, have been found.
Stratigraphic definitions.
The Hettangian was introduced in the literature by Swiss palaeontologist, Eugène Renevier, in 1864. The stage takes its name from Hettange-Grande, a town in north-eastern France, just south of the border with Luxembourg on the main road from Luxembourg City to Metz.
The base of the Hettangian stage (which is also the base of the Lower Jurassic series and the
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