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According to Dr Boyce’s hypothesis, it is therefore no coincidence that the second-most abundant source of coal today is rocks of the Cretaceous and the subsequent Caenozoic.

Then came the Caenozoic age, or age of mammals, three million years, with strata thirty-one hundred feet thick.

We must owe a debt to the monsters of Mesozoic and Caenozoic time; they helped to fertilize the soil for us, and to discipline the ruder forces of life.

Man seems to be the net result of it all, of all these vast cycles of Palaeozoic, Mesozoic, and Caenozoic life.