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Updated: June 27, 2025
I confess this is wholly incredible to me. The Permian and the Triassic deposits pass completely into one another; there is no sort of discontinuity answering to an unrecorded "Antetrias;" and, what is more, we have evidence of immensely extensive dry land during the formation of these deposits.
But, at the end of the Triassic period, the movement of depression recommenced in our area, though it was doubtless balanced by elevation elsewhere; modification and development, checked in the one province, went on in that "elsewhere;" and the chief forms of Mammals, Birds, and Reptiles, as we know them, were evolved and peopled the Mesozoic continent.
The lava worked like a giant mole up through and then beneath the Triassic sandstone, lifting the strata up and arching them over a large area. During the millions of years that have elapsed since that time, the layers of superincumbent sandstone have been worn away so that now one sees a wide, smooth, gentle slope of basaltic rock covered by a very thin coat of soil.
In England, France, and northern Germany, the only known strata of Upper Triassic date had consisted almost entirely of fresh or brackish-water beds, in which the bones of terrestrial and amphibious reptiles were the most characteristic fossils.
Triassic. : 21. Monotrema. Promammalia. : 21. Ornithodelphia. Echidna. Ornithorhyncus. Jurassic. : 22. Marsupalia. Prodidelphia. : 22. Didelphia. Didelphys. Perameles. Cretaceous. : 23. Mallotheria. Prochoriata. : 23. Insectivora. Erinaceida. Older Eocene. : 24. Lemuravida. Older lemurs. Dentition. 3. 1. 4. 3. : 24. Pachylemures. Neo-Eocene. : 25. Lemurogona. Later lemurs.
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 Mesozoic era has three periods, the Triassic, Jurassic and Cretaceous, while the Cenozoic era names five periods, the Eocene, Oligocene, Miocene, Pliocene and Pleistocene. Absence of Certain Strata.
It is mainly these later formations the Permian, the Jurassic, the Triassic, the Cretaceous, the Eocene, that give the prevailing features to the South-western landscape that so astonish Eastern eyes.
An imperfect intelligence, imperfectly taught, and this is the condition of our finite humanity, will certainly fail to keep all these laws perfectly. Disease is one of the penalties of one of the forms of such failure. Malformed specimens of Crinoids are known from the Triassic and Jurassic deposits.
As the name indicates, the walls are vividly colored and represent the uncertain line which separates the Carboniferous strata from the Triassic rocks.
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