Mesozoic animal alive today.

Mesozoic, the middle life, and the Cenozoic, the recent life.

The Mesozoic Era is an interval of geological time from about .

But you said that 100 million years ago, the water of the Mesozoic age turned to ice.

Much of the Mesozoic Era is represented by exposed outcrops in the many arid regions of the continent.

So we have a Mesozoic period, an age of fragmentation, and a Cenozoic period, an age of reconnection

During much of the Mesozoic Era, the North American continental interior were mostly well above sea level, with two major exceptions.

The effects of this catastrophe were so devastating that it took life on land 30 million years into the Mesozoic to recover.

A new ocean was growing on its southern end, the Tethys Ocean, an ocean that would dominate much of the Mesozoic Era.

So we have a Mesozoic period, an age of fragmentation, and a Cenozoic period, an age of reconnection South America to North America, India to Asia.

In fact, the Mesozoic, when dinosaurs lived, had much higher CO2 than today, was much warmer than today, and is one of the interesting proof points for the effects of CO2 on climate.

In fact, the Mesozoic, when dinosaurs lived, had much higher CO2 than today, was much warmer than today, and is one of the interesting proof points for the effects of CO2 on climate.

And so my work, really, is trying to understand the character of that Mesozoic radiation compared to the Cenozoic radiation to see what mysteries we can understand from dinosaurs and from other animals about what life on drifting continents really can tell us about evolution.

So even before that impact was known, even before scientists in general came to an agreement over the theory of evolution, scientists and natural historians of all kinds of stripes actually had divided Earth's life's history into these two episodes Mesozoic, the middle life, and the Cenozoic, the recent life.