ANIMALS OF THE PAST

INTRODUCTORY AND EXPLANATORY

Use of scientific names,xvi; estimates of age of earth,xvii; restorations by Mr. Knight,xviii; Works of Reference,xix.

I. FOSSILS, AND HOW THEY ARE FORMED

Definition of fossils,1; fossils may be indications of animals or plants, 2; casts and impressions,3; why fossils are not more abundant,4; conditions under which fossils are formed,5; enemies of bones,6; Dinosaurs engulfed in quicksand,8; formation of fossils,9; petrified bodies frauds,10; natural casts,10; leaves,13; incrustations,14; destruction of fossils, 15; references,17.

II. THE EARLIEST KNOWN VERTEBRATES

Methods of interrogating Nature,18; thickness of sedimentary rocks,20; earliest traces of life,21; early vertebrates difficult of preservation,22; armored fishes,23; abundance of early fishes,25; destruction of fish,26; carboniferous sharks,29; known mostly from teeth and spines,30; references, 32.

III. IMPRESSIONS OF THE PAST

Records of extinct animals,33; earliest traces of animal life, 34; formation of tracks,35; tracks in all strata,36; discovery of tracks,37; tracks of Dinosaurs,39; species named from tracks,41; footprints aid in determining attitude of animals, 43; tracks at Carson City,45; references,47.

IV. RULERS OF THE ANCIENT SEAS

The Mosasaurs,49; history of the first known Mosasaur,50; jaws of reptiles,53; extinction of Mosasaurs,55; the sea-serpent, 56; Zeuglodon,58; its habits,public@vhost@g@gutenberg@html@files@38013@[email protected]#Page_59"