A T. rex and triceratops were found buried together in Montana. A different T. rex was found in Wyoming. Scientists know the rock the T. rex was found in is the same age as the rock from Montana. This shows the principle of

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i think the miocene epoch spans the time from 23 million to 12 million years ago.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.