Archelon, Archelon ischyros

The Giant Turtle Archelon was a slow moving creature of the ancient seas during the Cretaceous (65 to 146 million years ago).  Some remains measure over 15 feet long.  Like many of today's turtles it ate jellyfish and expired drifting fish as well as plants, buried its eggs in sandy beaches, and may have lived more than 100 years.

Archelon Skeleton

This 120 million year old fossilized skeleton of an Archelonnext to a standing man gives a perspective of the size of these giant turtles

Giant Early Shark, Megalodon

Megalodon was a prehistoric shark that lived roughly from 28 to 1.5 million years ago, during the late Oligocene to early Pleistocene periods. Estimated to have been over 50 feet long it was one of the largest and most powerful vertebrate predators ever to have lived.
 

Meganeura monyi, Giant Dragonfly with a 29 Inch Wingspan

Meganeura monyi is a genus of extinct insects from the Carboniferous period approximately 300 million years ago and are related to the present-day dragonflies. They fed on other insects, and even small amphibians. M. monyi is one of the largest known flying insect species ever.

Glyptodon

Glyptodon was a huge armored mammal that lived in South and North America during the Pleistocene (1.8 million to 11,000 years ago). Some were as long as 16 feet and would have weighed about as much as a small car. They were related to modern day armadillos.  Glyptodon is believed to have been an herbivore, grazing on grasses and other plants.

 

Toxodon, Toxodon platensis

Toxodons, named for the curvature of their teeth, were a numerous species of mammal that lived in South America during the Pliocene and Pleistocene epochs from about 2.6 million to 16,000 years ago. Toxodons became extinct around the end of the Pleistocene. Some Toxodon fossils have been found with arrow heads indicating that they were hunted by humans who likely caused or contributed to their extinction.

Baluchitherium

Baluchitherium was an early hornless rhinoceros which lived in Asia and fed on tree leaves during the late Oligocene (24 to 38 million years ago ) and early Miocene (5 to 24 million years ago). It was the largest known land mammal to have lived, estimated to be 18 feet tall at the shoulder, 33 feet long and weighing more than 20 tons.

 

Stone Age Coloring Book
 

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