An illustration of a Devonian Period (419 to 358 million years ago) lake scene depicting a cycle of life. The Eurypterids (Sea Scorpions) feed on the smaller Trilobites dwelling on the lake bottom while the enormous placoderm fish Dunkleosteus, in turn, feeds on them.

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An Illustration Related To The Perpetual Struggle For Wealth.

An illustration of the dinosaur Brontosaurus excelsus (formerly known as Apatosaurus excelsus) depicted alongside an average height human. Brontosaurus was an extinct genus of sauropod dinosaur that lived in North America during the Late Jurassic period. It had an average length of 22.8 m (75 ft) and a mass of at least 16.4 metric tons.

An illustration of trilobites moving about on the bottom of a warm Paleozoic sea. 

Trilobites are a well-known fossil group of extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (521 million years ago), and they flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, all trilobite orders except Proetida died out. Trilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago. The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years

Trilobites range in length from 1 millimetre (0.04 in) to 72 centimetres (28 in), with a typical size range of 3–10 cm (1.2–3.9 in). The world's largest trilobite, Isotelus rex, was found in 1998 by Canadian scientists in Ordovician rocks on the shores of Hudson Bay.
(definition Source: Wikipedia)

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A herd of Woolly Mammoths march through an ice age forest 60,000 years ago.

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A 3-D computer illustration of colonies of the tiny extinct marine animals known as Diplograptus (Graptolites) of the Ordovician period (which occurred from 505 to 438 million years ago). Diplograptus is characterized by a caplike float from which featherlike assemblages of graptolite organisms were suspended. Though purely an artistic interpretation, the structure of the animal is inferred through scientific notation of what the species may have looked like within the environment in which they existed.


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