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.

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 ± 2.5 Ma (million years ago), to the beginning of the Permian period, about 299.0 ± 0.8 Ma.

Sea Fern Fossil

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