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 Oölitic system?
Fig. 31.  | Fig. 30.  |
Fig. 32.  |
Describe the Lias.