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And even as regards the Mammalia, the scanty remains of Triassic and Oolitic species afford no foundation for the supposition that the organization of the oldest forms differed nearly so much from some of those which now live as these differ from one another.
Stonesfield Slate. Fossil Mammalia. Fuller's Earth. Inferior Oolite and Fossils. Northamptonshire Slates. Yorkshire Oolitic Coal-field. Brora Coal. Palaeontological Relations of the several Subdivisions of the Oolitic group.
Magnified 3 diameters. In the upper part of the Mountain Limestone group in the south-west of England, near Bristol, limestones having a distinct oolitic structure alternate with shales. In these rocks the nucleus of every minute spherule is seen, under the microscope, to consist of a small rhizopod or foraminifer. Classification of the Old Red Sandstone in Scotland and in Devonshire.
This is now generally believed to have been the case with the Silurian, Devonian, Carboniferous, Oolitic, and Cretaceous limestones and those nummulitic rocks of tertiary date which bear the closest affinity to the Eozoon reefs of the Lower Laurentian. It has a strike from north-west to south-east, nearly at right angles to the metamorphic strata of the Grampians.
In order to establish these conclusions it was first pointed out that the calcareous rocks bordering the Gulf of Spezia, and abounding in Oolitic fossils, assume a texture like that of Carrara marble, in proportion as they are more and more invaded by certain trappean and Plutonic rocks, such as diorite, serpentine, and granite, occurring in the same country.
I recognised them at once as the palatal teeth of a fossil fish called "Lepidotus," common in our own oolitic and wealden strata, and in rocks of that age all over the world. They were white and colourless in life, but are stained of various colours according to the nature of the rock in which they were embedded.
Trimmer, the glacial drift in the cliffs at Lowestoft consists of two divisions, the lower of which abounds in the Scandinavian blocks, supposed to have come from the north-east; while the upper, probably brought by a current from the north-west, contains chiefly fragments of Oolitic rocks, more rolled than those of the lower deposit.
As I toiled up the side of the valley in the direction of Millau, I noticed the Rocher de Caylus, a large reddish and somewhat fantastically shaped block of oolitic rock, perched on the hill above the vineyards. Here the lower formation was schistous, the upper calcareous.
Masses of white, finely oolitic rock are attached to the outside of some of these coated pebbles.
In the shallow waters of the oolitic formation, the ichthyosaurus, plesiosaurus, and other huge saurian carnivora of the preceding age, plied, in increased numbers, their destructive vocation. To them were added new genera, the cetiosaurus, mososaurus, and some others, all of similar character and habits.
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