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form the cliffs
Edmontosaurus is thought to have lived in groups
snagging prey on its many teeth
Between 1929 and 1937
296 Index Trilobites of North America are illustrated on this poster
Machairodus giganteus, saber-toothed cat Tyrannosaurus Rex form the cliffsMachairodus is a genus of large machairodontine saber toothed cats that lived in Africa, China, Eurasia and North America during the late Miocene 4. 5 to 5 million years ago. It is the animal from which the subfamily Machairodontinae gets its name and has since become a wastebasket taxon over the years as many genera of saber tooth cat have been and are still occasionally lumped into it. In general Machairodus was similar in size to a modern lion or