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Updated: June 10, 2025
They would reflect with pride on the unshakable empire of the reptiles, and perhaps glance with disdain at two types of animals which hid in the recesses or fled to the hills of the Jurassic world. And before another era of the earth's story opened, the reptile race would be dethroned, and these hunted and despised and feeble eccentricities of Mesozoic life would become the masters of the globe.
The mammal and the bird are already on the stage, but their warm coats and warm blood offer no advantage in that perennial summer, and they await in obscurity the end of the golden age of the reptiles. At the end of the Jurassic the land begins to rise once more. The warm, shallow seas drain off into the deep oceans, and the moist, swampy lands are dried.
The Jurassic or first part of the reptilian time shades insensibly into the second part, called the Cretaceous, which immediately follows it.
But there are other reptiles now living that easily beat the ichthyosaurus, such, for example, as the larger pythons or rock-snakes, which not infrequently reach to thirty feet, and measure round the waist as much as a London alderman of the noblest proportions. Of course, other Jurassic saurians easily beat this simple record.
By reference to the tables given at the end of the last chapter the reader will see that when the fossiliferous rocks are arranged chronologically, we have first to consider the Post-tertiary and then the Tertiary or Cainozoic formations, and afterwards to pass on to those of older date. Laurentian. 2. Cambrian. 3. Silurian. 4. Devonian. 5. Carboniferous. 6. Permian. 7. Triassic. 8. Jurassic. 9.
The soil is a Jurassic limestone: the rain penetrates the porous rock, and sinks through cracks and fissures, to reappear above the base of the mountain in a full-grown stream. This is a defect in the Generoso, as much to be regretted as the want of shade upon its higher pastures.
On November 12, 1871, the Jura sections met at a congress in Souvillier, in which they certainly accepted the name "Jurassic Union," but declared the "Romance Union" to be dissolved; appealed against the decisions of the London Conference as well as against their legality, and appealed to a general congress, to be called immediately.
This summary account of the levelling process which went on during the Triassic and Jurassic will prepare us to expect a return of warm climate and luxurious life, and this the record abundantly evinces.
In so doing I am anticipating the true geological order, because I must treat of the Jurassic and Cretaceous deposits, which are still far in advance of us; but as it was by the study of these deposits that the circumscription of the Periods, as I have defined them above, was first ascertained, I must allude to them in this connection.
This will be clearer if we glance in succession at the various types of plant which adorned and enriched the Jurassic world. The European or American landscape indeed, the aspect of the earth generally, for there are no pronounced zones of climate is still utterly different from any that we know to-day.
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