Kimmeridgian Age/Stage
Late Jurassic: 157.3 to 152.1 million years ago
The Kimmeridgian Stage was named in 1842 by French geologist Alcide d’Orbigny after the village of Kimmeridge on the Dorset coast in England.
Oxfordian Age/Stage
Late Jurassic: 163.5 to 157.3 million years ago
The Oxfordian Stage was tthe beginning of the Late or Upper Jurassic Period. It was named in 1844 by Alcide d’Orbigny after the English city of Oxford. William Buckland called it “Oxford, Forest or Fen Clay”. Before that William “Strata” Smith called it “Clunch Clay and Shale” in 1815 to 1816.
Callovian Age/Stage
Middle Jurassic: 166.1 to 163.5 million years ago
The Callovian Stage marks the end of the Middle Jurassic Period. It was named in 1852 by French paleontologist Alcide d’Orbigny. The names is derived from the latinized form of Kellaways Bridge, a small hamlet 3 km northeast of Chippenham, Wiltshire, England.
Bathonian Age/Stage
Middle Jurassic: 168.3 to 166.1 million years ago
The Bathonian Stage was first named in 1843 by Belgian geologist d’Omalius d’Halloy after the English town of Bath. The latinized form of the town is Bathonium. In 1852 French paleontologist Alcide d’Orbigny defined the exact length of the stage.
Bajocian Age/Stage
Middle Jurassic: 170.3 to 168.3 million years ago
The Bajocian Stage was first named in 1842 by the French paleontologist Alcide d’Orbigny after the town of Bayeux in the region of Normandy in France.
Aalenian Age/Stage
Middle Jurassic: 174.1 to 170.3 million years ago
The Aalenian Stage was first named in 1864 by the Swiss geologist Karl Mayer-Eymar after the town of Aalan, about 70 kilometers east of Stuttgart in Germany.
Toarcian Age/Stage
Early Jurassic: 182.7 to 174.1 million years ago
The Toarcian Stage was first named in 1844 by the French paleontologist Alcide d’Orbigny after the city of Thouars, south of Saumur in the Loire Valley of France.
Pliensbachian Age/Stage
Early Jurassic: 190.8 to 182.7 million years ago
The Pliensbachian Stage was first named in 1858 by the German paleontologist Albert Oppel after the hamlet of Pliensbach of the ommunity of Zell unter Aichelberg in the Swabian Alb, east of Stuttgart, Germany.
Sinemurian Age/Stage
Early Jurassic: 199.3 to 190.8 million years ago
The Sinemurian Stage was first named in 1842 by French Paleontologist Alcide d’Orbigny after the French town of Semur-en-Auxois near Dijon.
Hettangian Age/Stage
Early Jurassic: 201.3 to 199.3 million years ago
The Hettangian Stage was first named in 18624 by Swiss paleontologist Eugene Renevier after town of Hettange-Grande in northeastern France.
