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Updated: June 10, 2025
On the other hand, the Bennettiteae of the Jurassic have the mixed characters of ferns, cycads, and flowering plants, and thus, in their turn, point downward to a lower ancestry and upward to the next great stage in plant-development. It is not suggested that the seed-ferns we know evolved into the cycads we know, and these in turn into our flowering plants.
Now, in imagination, restore these cliffs of Permian, Triassic, Jurassic and even Cretaceous strata over the whole Canyon platform. Red Butte, which is the prominent landmark seen from the railway on the right, when going from Williams to the Canyon, is said to be a remnant of the Permian. Deposition of Strata in Shallow Water.
The warmth of the Jurassic period is generally attributed to the low relief of the land, and the very large proportion of water-surface. The effect of this would be to increase the moisture in the atmosphere. Whether this was assisted by any abnormal proportion of carbon-dioxide, as in the Carboniferous, we cannot confidently say.
A glance at any geological map of the world will show the reader that the Valley of the Amazons, so far as any attempt is made to explain its structure, is represented as containing isolated tracts of Devonian, Triassic, Jurassic, cretaceous, tertiary, and alluvial deposits.
The trouble was a harpy a thing about the size and general design of a Terran Jurassic pterodactyl, big enough to take a Little Fuzzy at one mouthful. It must have made one swoop at him already, and was circling back for another. It ran into a 6-mm rifle bullet, went into a backward loop and dropped like a stone.
It must of seemed longer to Oswald than it takes for a chinch bug to become a carboniferous Jurassic. She was committing sabotage on him in the cruellest way. Then, after watching his death agony with cold eyes and pretending to wonder like a rattled angel, she brightens up and says: "Oh, goody! Now I remember everything. I placed them right here."
So much for the evolutionary aspect of the Jurassic vegetation in itself. Slender as the connecting links are, it points clearly enough to a selection of higher types during the Permian revolution from the varied mass of the Carboniferous flora, and it offers in turn a singularly varied and rich group from which a fresh selection may choose yet higher types.
Ages ago, long before snakes and four-toed horses were even foreshadowed, and before the first bird-like creatures had appeared, winged reptile-dragons flew about, doubtless roosting or perching on the Triassic and Jurassic trees. Perhaps the very pieces of coal which are burned in our furnaces once bent and swayed under the weight of these bulky animals.
This discovery proved to be a graveyard of prehistoric monsters dating back probably several millions of years ago. Entombed in the rocks of the Jurassic and Cretaceous periods, many lizard-like animals of gigantic size called saurians were found.
The Permian stress has selected the fittest types to survive from the older order; the Jurassic luxuriance is permitting a fresh and varied expansion of life, in preparation for the next great annihilation of the less fit and selection of the more fit. Life pauses before another leap.
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