Geological time table
The history of the earth can be divided into different chapters. These chapters can be divided into sections, these sections into paragraphs, and these paragraphs into sentences, words and eventually letters. The chapters of the earth’s history are called: Archaic, Proterozoic and Phanerozoic. The Archaic started about 4.5 billion years ago and ended 2.5 billion years ago. The Proterozoic started where the Archaic ended and ceased about 570 million years ago. Then, the chapter within which we still live, the Phanerozoic, started. The first two chapters of the earth’s history are together called the Precambrian. The most important events were the development of life and the formation of moving tectonic plates. The third chapter, the Phanerozoic, is often called the Cambrian. Something very special happened during the Cambrian: intelligent and organised animals developed who consisted of hard parts (i.e. skeletons). From that moment on, the age of stones could be determined by calculating the age of fossils.