Author:  Bill Bryson
Viewed: 116 - Published at: 4 years ago

Nowadays, and speaking very generally, geological time is divided first into four great chunks known as eras: Precambrian, Palaeozoic {from the Greek meaning "old life"}, Mesozoic {"middle life"} and Cenozoic {"recent life"}. These four eras are further divided into anywhere from a dozen to twenty subgroups,

( Bill Bryson )
[ A Short History of Nearly ]
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