the high.

[16] For objections which may be brought against this and similar
statements, see the Appendix.

+---+--------------------------+---------------------------------------
| |_Epochs and Formations._ |_Faunal Characters._
|C | |
|a |--------------------------+---------------------------------------
|i |POST-PLIOCENE. |Man. Mammalia principally of living
|n | Glacial Period. | species. Mollusca exclusively recent.
|o | +---------------------------------------
|z |PLIOCENE, 3,000 feet. |Mammalia principally of recent genera
|o | | --living species rare. Mollusca very
|i | | modern.
|c | +---------------------------------------
| |MIOCENE, 4,000 ft. |Mammalia principally of living
|o | | families; extinct genera numerous;
|r | | species all extinct. Mollusca largely
| |OLIGOCENE, 8,000 ft. | of recent species.
|T | +---------------------------------------
|e |EOCENE, 10,000 ft. |Mammalia with numerous extinct families
|r | | and orders; all the species and
|i | | most of the genera extinct. Modern
|a | | type Shell-Fish.
|r | |
|y | |
+---|--------------------------+---------------------------------------
| |LARAMIE, 4,000 ft. |Passage beds.
| |--------------------------+---------------------------------------
|M |CRETACEOUS, 12,000 ft. |Dinosaurian (bird-like) Reptiles;
|e | Chalk. | Pterodactyls (flying Reptiles);
|s | | toothed Birds; earliest Snake; bony
|o | | Fishes; Crocodiles; Turtles;
|z | | Ammonites.
|o | +---------------------------------------
|i |JURASSIC, 6,000 ft. |Earliest Birds; giant Reptiles
|c | Oolite. | (Ichthyosaurs, Dinosaurs,
| | Lias. | Pterodactyls); Ammonites; Clam- and
|o | | Snail-Shells very abundant; decline
|r | | of Brachiopods; Butterfly.
| | +---------------------------