Coralline Crag Formation

The Coralline Crag Formation is a geological layer on the North Sea coast of Suffolk made up mainly of shell fragments, calcareous rocks, and fine sand. The layer spreads across several locations near Aldeburgh and Orford and shows the remains of many marine organisms from ancient times.

This formation was created millions of years ago when marine organisms like oysters and bryozoans died on the seafloor and piled up in thick layers. Over time this material hardened into rock and was later pushed up to the surface where it is visible today.

The stones from this formation were used in local church construction, and visitors can still see them in buildings around the area today. People in the region recognized the material as durable and suitable for building lasting structures.

You can visit this formation at several spots, particularly near the coastal towns of Aldeburgh and Orford, where paths are available for exploring. The best time to visit is at low tide, when more of the layer becomes visible.

The fossils in this layer show that the sea here was once warmer than today and held different types of creatures. These finds help scientists understand how the seas and coastlines have changed over time.

Location: England

GPS coordinates: 52.12000,1.53000

Latest update: December 14, 2025 11:02