Answer
The Blue Lias cliffs belong to the Jurassic geological period, a time span around 201.3 million to 145 million years ago. During the Jurassic, Earth experienced a warm climate, leading to the proliferation and dominance of dinosaurs, the emergence of early birds and mammals, and the diversification of plant life. Notable geographic shifts occurred, including the fragmentation of the supercontinent Pangea and the formation of the Atlantic Ocean.