Palaeontology is the study of past life based on fossils records.The study of fossils reveals the type of life forms occurring in the past and highlight the course evolution of living organisms. The distribution of fossils in the sedimentary rocks of different ages fully support the concept of evolution. It shows that structure of wing become more and none complex as we proceed from earlier to recent times. From the fossil records it has been concluded that evolution has taken place from the simple to complex form in a gradual manner.