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Updated: June 10, 2025
Some of the fragments of Ammonites were as thick as a man's arm: the Gryphaea is much the most abundant shell. These fossils M. d'Orbigny considers as belonging to the Neocomian stage of the Cretaceous system. Dr. Trigonia costata, identical with those found in the upper Jurassic beds at Hildesheim. 3. Pecten striatus, identical with those found in the upper Jurassic beds at Hildesheim. 4.
Then, forth from that archaic sea, the Ichthyosaurus Uprose upon his finny wings, with neocomian fuss, "O Iguanodon!" he cried, as he approached the shore, "Why art thou thus dysthynic, love? Come, rise with me, and soar, Or leave these estuarian seas, and wander in the grove; Behold! a bird-like reptile fish is dying for thy love!"
Atherfield Clay. Similarity of Conditions causing Reappearance of Species after short Intervals. Upper Speeton Clay. Middle Neocomian. Tealby Series. Middle Speeton Clay. Lower Neocomian. Lower Speeton Clay. Wealden Formation. Fresh-water Character of the Wealden. Weald Clay. Hastings Sands. Punfield Beds of Purbeck, Dorsetshire. Fossil Shells and Fish of the Wealden. Area of the Wealden.
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!
If we pass to the American continent, we find in the State of New Jersey a series of sandy and argillaceous beds wholly unlike in mineral character to our Upper Cretaceous system; which we can, nevertheless, recognise as referable, palaeontologically, to the same division. That they were about the same age generally as the European chalk and Neocomian, was the conclusion to which Dr.
I am strengthened in this conclusion of there having been two distinct, great periods of subsidence, by reflecting on the thick mass of coarse stratified conglomerate in the valley of Tenuyan, between the Peuquenes and Portillo lines; for the accumulation of this mass seems to me, as previously remarked, almost necessarily to have required a prolonged subsidence; and this subsidence, from the pebbles in the conglomerate having been to a great extent derived from the gypseous or Neocomian strata of the Peuquenes line, we know must have been quite distinct from, and subsequent to, that sinking movement which probably accompanied the deposition of the Peuquenes strata, and which certainly accompanied the deposition of the equivalent beds near the Puente del Inca, in this line of section.
According to the old nomenclature, this subdivision of the chalk was called Upper Greensand, in order to distinguish it from those members of the Neocomian or Lower Cretaceous series below the Gault to which the name of Greensand had been applied.
Godwin-Austen has shown, fragments and water- worn fossils of the oolitic rocks, speak plainly of the nature of the pre- existing formations, by the wearing down of which the Neocomian beds were formed. The land, consisting of such rocks, was doubtless submerged before the origin of the white chalk, a deposit which was formed in a more open sea, and in clearer waters. Perna Mulleti, Desh.
Beneath the Atherfield clay or Upper Neocomian of the S.E. of England, a fresh- water formation is found, called the Wealden, which, although it occupies a small horizontal area in Europe, as compared to the White Chalk and the marine Neocomian beds, is nevertheless of great geological interest, since the imbedded remains give us some insight into the nature of the terrestrial fauna and flora of the Lower Cretaceous epoch.
Judd remarks that as Ammonites clypei-formis and Terebratula hippopus characterise the Middle Neocomian of the Continent, it is to this stage that the Tealby series containing the same fossils may be assigned.
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