As mentioned in an earlier article, carbon isotopes are quite good at allowing us to calculate the age of fossils.Another way that fossils are dated is through relative age dating.Fossils tend to be found in sedimentary rock because metamorphic rock and igneous rock tend to destroy the fossils, due to high pressure and heat that the rocks undergo in formation.Sedimentary rocks tend to be formed in layers with each being from a different time period.
Information about one of the rock layers will appear – drag the hammer and drop it onto the layer you think is being described. This layer formed on top of earlier rocks after they were tilted and eroded away. Each chapter will include a few questions designed to test your knowledge of material covered in the chapter and in the Internet-based resources. This interactive asks you to use your knowledge of relative dating. Help us work out the relative ages of the layers of sedimentary rocks.You need to work out the order in which rocks were formed, from youngest to oldest. Remember that younger sedimentary rocks lie on top of older ones and were horizontal when formed.It looks as though one group of layers was tilted and eroded away before new rocks were formed on top.