Alba Layer

Alba Layer

 

alb (from Alba, the Latin name for the Aube River in France), the upper layer of the lower section of a cretaceous system; identified by A. D. d’Orbigny in 1842.

A typical sample is composed of clay and sandstone with characteristic complexes dominated by ammonites, such as Donvilleiceras and Hoplites dentatus. It is widespread in Europe (the Anglo-Parisian basin, the East European platform), in the Caucasus, in the Great Balkhan, and in the Pacific Ocean area (Kamchatka, Japan, Alaska).