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Outlined below is a summary of each presentation and all resources are attached at the bottom for you to use.

A massive thank you to those who presented and as we hope to run this event again, anyone interested in presenting next time, please do email Sarah Nathaniel.

Sedimentary rock is made of particles derived from other rocks, so measuring isotopes would date the original rock material, not the sediments they have ended up in.

However, there are radiometric dating methods that can be used on sedimentary rock, including luminescence dating.

These rates of decay are known, so if you can measure the proportion of parent and daughter isotopes in rocks now, you can calculate when the rocks were formed.

Because of their unique decay rates, different elements are used for dating different age ranges.

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Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element.

The table below shows characteristics of some common radiometric dating methods.

Geologists choose a dating method that suits the materials available in their rocks. Measuring isotopes is particularly useful for dating igneous and some metamorphic rock, but not sedimentary rock.

Geologists often need to know the age of material that they find.

They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.

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