Miracles of fossilisation
It seems impossible that the delicate wing of an insect could be preserved for millions of years, but under certain circumstances it does happen. The Purbeck Beds are recognised as containing an amazing number of beetles, flies, dragonflies. They are preserved in very fine mud known as micrite, that settled on the floor of lagoons and ponds. The micrite is so fine that it preserved the detail of the fragile insects. The rocks tell us that insects have been around for a very long time, and have hardly changed. They are, in fact, living fossils.
Find out more on the insects page.