Bathonian


In the geologic timescale the Bathonian is an age and stage of the Middle Jurassic. It lasted from approximately 168.3 Ma to around 166.1 Ma. The Bathonian age succeeds the Bajocian age and precedes the Callovian age.

Stratigraphic definitions

The Bathonian stage takes its name from Bath, a spa town in England built on Jurassic limestone. The name was introduced in scientific literature by Belgian geologist d'Omalius d'Halloy in 1843. The original type locality was located near Bath. The French palaeontologist Alcide d'Orbigny was in 1852 the first to define the exact length of the stage.
The base of the Bathonian is at the first appearance of ammonite species Parkinsonia convergens in the stratigraphic column. The global reference profile for the base of the Bathonian was ratified as Ravin du Bès, Bas-Auran area, Alpes de Haute Provence, France in 2009. The top of the Bathonian is at the first appearance of ammonite genus Kepplerites.
In the Tethys domain, the Bathonian contains eight ammonite biozones:
Rocks of Bathonian age are well developed in Europe: in the northwest and southwest oolite limestones are characteristically associated with coral-bearing, crinoidal and other varieties, and with certain beds of clay. In the north and northeast, Russia, etc., clays, sandstones and ferruginous oolites prevail, some of the last being exploited for iron. They occur also in the extreme north of North America and in the Arctic regions, Greenland, Franz Josef Land, etc.; in Africa, Algeria, Tanzania, Madagascar and near the Cape of Good Hope ; in India, Rajputana and Gulf of Kutch, and in South America.
The well-known Caen stone of Normandy and "Hauptrogenstein" of Swabia, as well as the "Eisenkalk" of northwest Germany, and "Klaus-Schichten" of the Austrian Alps, are of Bathonian age.

Palaeontology

Amphibia

†Ankylosaurs

†Ornithopods

†Sauropods

†Stegosauria

†Plesiosaurians

†Thalattosuchians

Theropods

†Ammonitida

†Belemnites

Literature