Blue Anchor to Lilstock Coast SSSI (grid reference ST033435 to grid reference ST195462) is a 742.8 hectare geological Site of Special Scientific Interest between Blue Anchor and Lilstock in Somerset, notified in 1971.

It provides an outstanding series of sections through the Early Jurassic Lower Lias, spanning the Hettangian and Pliensbachian Stages and named the "Lilstock Formation".

This sequence and the good Rhaetian succession beneath are repeatedly affected by faulting,[1] making it of interest to geologists and fossil hunters.

It also displays coastal geomorphology which demonstrates a particularly well-developed series of intertidal shore platforms varying in width from about 200-600m.

The cliff and beach are rich in reptile remains, including complete skeletons.