Blackwell Publishing
Precambrian Paleozoic Mesozoic Cainozoic
Triassic 248 MYRBP Jurassic 213 MYRBP Cretaceous 144 MYRBP

The evolution of mammals from reptiles took some 40 million years. The intermediete creatures, such as Probelesodon, exhibit increasingly typical mammalian characteristics. These include a high metabolism type physiology, upright rather than sprawling gait and powerful teeth and jaw articulation.

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