The best soils are in the west section, where limestone clays or shell marls are common.
Laornis from the Cretaceous marls of New Jersey was as large as a swan.
In this part of its course the rocky sides of the valley, which sometimes closely approach the river, are composed of marls and gypsum, with occasional selenite, overlaid with sandstone, with a topping of breccia or conglomerate, and rise at places to a height of 200 ft.
The sulphur occurs in Miocene marls and limestone, associated with.
Nodular forms of sulphur occur in Miocene marls near Radoboj in Croatia, and near Swoszowic, south of Cracow.