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Updated: June 10, 2025
The Upper division, or Weald Clay, is, in great part, of fresh-water origin, but in its highest portion contains beds of oysters and other marine shells which indicate fluvio-marine conditions. The uppermost beds are not only conformable, as Dr. Fitton observes, to the inferior strata of the overlying Neocomian, but of similar mineral composition.
At Blackdown this unconformability is still more marked, for though distant only 100 miles from Kent and Surrey, no formation intervenes between these beds and the Trias; all intermediate groups, such as the Lower Neocomian and Oolite, having either not been deposited or destroyed by denudation.
Even now the Blackdown beds in Devonshire, which rest immediately on Triassic strata, and which evidently belong to some part of the Cretaceous series, have been referred by some geologists to the Upper group, by others to the Lower or Neocomian.
In confirmation of this view it may be stated that the remains of the Iguanodon Mantelli, a gigantic terrestrial reptile, very characteristic of the Wealden, has been discovered near Maidstone, in the overlying Kentish Rag, or marine limestone of the Upper Neocomian.
Post-glacial : Upper diluvial. Glacial : Lower diluvial. Arverne : Upper pliocene. Subapennine : Lower pliocene. Falun : Upper miocene. Limbourg : Lower miocene. Aquitaine : Upper oligocene. Ligurium : Lower oligocene. Gypsum : Upper eocene. Coarse chalk : Middle eocene. London clay : Lower eocene. White chalk. : Upper cretaceous. Green Sand : Middle cretaceous. Neocomian : Lower cretaceous.
Several gold veins and some of copper- ore are worked in several parts of the Uspallata range, both in the metamorphosed strata, which have been shown to have been of probably subsequent origin to the Neocomian or gypseous formation of the main Cordillera, and in the intrusive andesitic rocks of that range.
Flora of the Wealden. Upper Neocomian Greensand of Folkestone, Sandgate, and Hythe, Atherfield clay, upper part of Speeton clay: Part of Wealden beds of Kent, Surrey, Sussex, Hants, and Dorset. Middle Neocomian Punfield Marine bed, Tealby beds, middle part of Speeton clay: Part of Wealden beds of Kent, Surrey, Sussex, Hants, and Dorset.
During the year 1836, though pushing forward constantly the publication of the "Poissons Fossiles," his "Prodromus of the Class of Echinodermata" appeared in the Memoirs of the Natural History Society of Neuchatel, as well as his paper on the fossil Echini belonging to the Neocomian group of the Neuchatel Jura, accompanied by figures.
Newberry and others, that the Cretaceous strata of the United States east and west of the Appalachians are characterised by a flora decidedly analogous to that of Aix-la-Chapelle above-mentioned, and therefore having considerable resemblance to the vegetation of the Tertiary and Recent Periods. Classification of marine and fresh-water Strata. Upper Neocomian. Folkestone and Hythe Beds.
Bemoaning thus, by dumous path, they crushed the cycad's growth, And many a crash, and thunder, marked the progress of them both. And when they reached the estuary, the excandescent sun Was setting o'er the hefted sea; their saurian day was done. Then raised they paraseline eyes unto the flaming moon, And wept the Neocomian Age was passing all too soon! O Iguanodon! O Earth! O Ichthyosaurus!
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