aged Muschelkalk of southern Germany, but he erroneously concluded that they were older. He then named them Jura-Kalkstein ('Jura limestone') in 1799.

In 1829, the French naturalist Alexandre Brongniart published a book entitled Tableau des terrains qui composent l'écorce du globe, ou Essai sur la structure de la partie connue de le Terre [Description of the Terrains that Constitute the Crust of the Earth or Essay