Barremian Layer

(named after the village of Barrème, in southeast France), the fourth layer from the bottom in the lower series of the Cretaceous system. It was established in 1862 by the French geologist Coquand. It is typically composed of argillaceous limestones with ammonites, the latter forming four zones of varying composition. The Barremian layer is widely distributed in the alpine geosynclinal region. On the Russian platform it is composed of sand and clay rock with ammonites, among which representatives of the Simbirskites genus predominate.