Smokejack Clay Pit is a 56-hectare (140-acre) geological Site of Special Scientific Interest east of Cranleigh in Surrey.

[3][4] This site exposes Lower Cretaceous rocks of the Weald Clay Group, which have been studied since 1983.

It is the best Weald Clay reptile site, with crocodile teeth, coprolites and part of an Iguanodon.

The holotype specimen of the fish eating theropod dinosaur, Baryonyx walkeri was discovered on the site in January 1983.

The surviving ruins date back to the 1960s and were previously known as the Smokejack Brickworks, which closed down during the 1980s.