Traces of animals over 166 million years old have been discovered in England.

Scientists have determined that the tracks were left by two distinct species of dinosaurs — the long-necked sauropod Cetiosaurus and the smaller carnivore Megalosaurus.

The length of the longest tracks measures 150 meters. It is likely that their continuation can be discovered with further excavations.

The tracks were first noticed by Gary Johnson, an excavator operator working at the Dewars Farm quarry. While clearing clay, he stumbled upon a small ridge. It turned out to be solidified ground, pressed by an enormous heavy foot. Johnson examined the surrounding area and found the next imprint three meters away from the first, followed by another and another.

Last summer, over 100 scientists, students, and volunteers joined in the excavations at the quarry. A total of five tracks of varying sizes were discovered. From the largest of these — the tracks of sauropods, herbivorous dinosaurs that walked on four legs — it was concluded that these animals reached lengths of up to 18 meters.