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This is a diagram showing the rocks of the successive periods of time. They are shown in order from the Archaean, in Northern New York, southwestward to the Coal-formation of Pennsylvania, showing that they succee one another on the map simply because they come to the surface in succession

Archaean Time

This is a diagram showing the rocks of the successive periods of time. They are shown in order from…

"Bear Butte, from the North." -Walcott, 1901

Bear Butte

"Bear Butte, from the North." -Walcott, 1901

Favosites alcyonaria is a species of fossil corals from the Silurian, Devonian, and Carboniferous strata.

Fossil Coral

Favosites alcyonaria is a species of fossil corals from the Silurian, Devonian, and Carboniferous strata.

A species of Seed Fern (Sphenopteris obtusiloba) is a fossil fern in the Carboniferous Era.

Seed Fern

A species of Seed Fern (Sphenopteris obtusiloba) is a fossil fern in the Carboniferous Era.

A species of Seed Fern (Sphenopteris latifolia) is a fossil fern in the Carboniferous period.

Seed Fern

A species of Seed Fern (Sphenopteris latifolia) is a fossil fern in the Carboniferous period.

This illustration shows a section of a tooth of a typical Labyrinthodont. Labyrinthodont, or Stegocephali is a race of extinct amphibians, the remains of which are found in the Permian, Carboniferous, and Triassic strata. Many of them were giants compared with our modern amphibians, from which they differed markedly in possessing an armature of bony plates in various degrees of completeness. In general habit, they resembled the newt or salamander. The name Labyrinthodont refers to the mazy pattern exhibited on a transverse section of the teeth of some genera. Among the best known genera are Archegosaurus, Loxomma, and Mastodonsaurus.

Section of Tooth of Typical Labyrinthodont

This illustration shows a section of a tooth of a typical Labyrinthodont. Labyrinthodont, or Stegocephali…

This illustration shows a portion of Lepidodendron. Lepidodendron is the generic name of a large and important group of plants which flourished principally in the Carboniferous period. The outer surface of the bark is marked by lozenge-shaped, scale-like markings, the leaf-cushions. These are arranged in dense spirals, which wind around the stems. Often, the narrow and pointed leaves are found, still adherent; they may also carry cones <i>(lepidostrobi)</i>, which in form somewhat resemble those of the fir. The branches usually fork repeatedly, and were implanted on a massive stem which had a similar external sculpture. Some of these stems have been seen in the roofs of coal workings with a length of a hundred feet. Their roots are generally known as stigmaria. The Lepidodendra belonged to the Lycopodiaceæ, and have their nearest representatives in the diminutive club-mosses, which they resemble even in their superficial characters.

Portion of Lepidodendron

This illustration shows a portion of Lepidodendron. Lepidodendron is the generic name of a large and…

A section of the Paleozoic rocks found in the Mississppi basin illustrating the periods and ages.

Paleozoic Rocks

A section of the Paleozoic rocks found in the Mississppi basin illustrating the periods and ages.

"Diagrammatic structure section of the Wasatch Range in Ogden Canyon." -Lee, 1915

Rock Layers Showing Geological Periods

"Diagrammatic structure section of the Wasatch Range in Ogden Canyon." -Lee, 1915

An illustration of a sea fern fossil from the carboniferous period. The Carboniferous is a geologic period and system that extends from the end of the Devonian period, about 359.2 &plusmn; 2.5 Ma (million years ago), to the beginning of the Permian period, about 299.0 &plusmn; 0.8 Ma.

Sea Fern Fossil

An illustration of a sea fern fossil from the carboniferous period. The Carboniferous is a geologic…