[Ill.u.s.tration: Fig. 24.]

[Ill.u.s.tration: Fig. 25.]

[Ill.u.s.tration: Fig. 26.]

What are the four most abundant forms?

Describe the Stigmaria. The Sigillaria. The Lepidodendron. The Calamite.

Where are the beds of coal found?

What is the fourth formation of rocks?

Into what two portions is it divided?

Of what does the Permian portion consist?

The Trias?

What minerals are found in this formation?

What springs?

[Ill.u.s.tration: Fig. 27.]

[Ill.u.s.tration: Fig. 28.]

[Ill.u.s.tration: Fig. 29.]

What fossils?

How are the fishes of the earlier and later portions distinguished?

What peculiarity of the red sandstones is mentioned?

By what kinds of animals were the tracks, which they contain, made?

Give localities of the new red sandstone.

What are the three divisions of the Oolitic system?

[Ill.u.s.tration: Fig. 30.]

[Ill.u.s.tration: Fig. 31.]

[Ill.u.s.tration: Fig. 32.]

Describe the Lias.

The Oolite.

The Wealden.

What are the general peculiarities of the system?

[Ill.u.s.tration: Fig. 33.]

What are the fossil animals of the system?

By which cla.s.s of fossil animals is the system characterized?

[Ill.u.s.tration: Fig. 34.]

Describe the Ichthyosaurus. The Plesiosaurus. Pterodactyle. The Iguanodon.

Where is the system developed?

What are the divisions of the Cretaceous system?

How are the layers of chalk separated?

What is the geological position of the Neocomian system, and the greensand of this country?

What are the fossils of this system?

[Ill.u.s.tration: Fig. 35.]

[Ill.u.s.tration: Fig. 36.]

What the geographical range?

How are the tertiary deposits distinguished from the older formations?

Upon what principle is the tertiary system divided?

What are these divisions called, and what does each, name signify?

[Ill.u.s.tration: Fig. 37.]

[Ill.u.s.tration: Fig. 38.]

[Ill.u.s.tration: Fig. 39.]

[Ill.u.s.tration: Fig. 40.]

[Ill.u.s.tration: Fig. 41.]

[Ill.u.s.tration: Fig. 42.]