Slinfold Stream and Quarry is a 2.3-hectare (5.7-acre) geological Site of Special Scientific Interest west of Horsham in West Sussex.

[3] This site exposes the Horsham Stone member of the Lower Weald Clay, dating to the Early Cretaceous, around 130 million years ago.

It preserves the fossils of horsetails in their upright position, suggesting that they grew in a fresh water reedswamp with a maximum depth of 2 metres (2.2 yards).

[4] A public footpath goes through a small stretch of the stream bank but the rest of the site is private land with no public access.

This article about a Site of Special Scientific Interest in England is a stub.