It is the only SSSI in the county which is designated both for its biological and geological interest.

[1][2] It is also a Geological Conservation Review site,[3] and an area of 8 hectares is the Roswell Pits nature reserve, which is managed by the Wildlife Trust for Bedfordshire, Cambridgeshire and Northamptonshire.

[4] This site on the bank of the River Great Ouse has disused clay and beet pits, grassland and ponds.

It has yielded an extensive assemblage of fossils reptiles dating to the Kimmeridgian, around 155 million years ago in the late Jurassic.

[5] There is access to Roswell Pits by a footpath from Kiln Lane.