Geological Timescale 0.0 / 5 ? GeographyRock landscapes and processesGCSEAQA Created by: Mr_MackintoastCreated on: 11-04-17 11:11 How old is the earth? The earth is 4.6 billion years old 1 of 8 What happened in the first 0.7 billion years? First 0.7 billion years- nothing is known 2 of 8 When was life on earth abundant? Life on earth became abundant 542 million years ago 3 of 8 What characterises a period? A period is characterised by the type of plants/animals that lived there during that time 4 of 8 When was chalk formed? Chalk was formed 65-145 million years (Mesazoic Era, Cretaceous Period) 5 of 8 When was clay formed? Clay was formed 2-199 million years (Cenozoic/Mesozoic Era, Tertiary, Creatceous, Jurassic Periods) 6 of 8 When was granite formed? Granite was formed 280 million years (late palezoic era, permian period) 7 of 8 When was carboniferous limestone formed? Carboniferous Limestone was formed 340 million years (late palezoic era, permian period) 8 of 8
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