Bathonian
Bathonian is a standard stage of the Middle Jurassic epoch in the International Chronostratigraphic Chart. It spans roughly 168.3 to 166.1 million years ago, following the Bajocian and preceding the Callovian. The name derives from Bath, a city in Somerset, England, where rocks of this age were first studied in the 19th century.
The lower boundary of the Bathonian is defined by stratigraphic markers tied to characteristic fossil horizons,
Palaeogeographically, the Bathonian was a time of relatively warm global conditions with high sea levels. Widespread
The Bathonian is well represented in the fossil record by marine invertebrates, especially ammonites, belemnites, and
In geology and paleontology, the Bathonian serves as a useful horizon for regional correlations across Europe