Lydney Cliff

Lydney Cliff is a geological Site of Special Scientific Interest in Gloucestershire, notified in 1990. Part of the site is included in the Severn Estuary SSSI.

Geology

The site has exposures in the Raglan Marls of the Lower Devonian time period. The section includes calcrete profiles and a complex sand-body. The sandstone has fish fragments. The outcrop is significant for research in assessing the extent of marine tidal influence on the sequence in the Lower Old Red Sandstone. The site has contributed significantly to the geological record.
The site has two important fish beds and the assemblage is regarded as proof of a marine incursion within environments which are predominantly estuarine to fluvial. Other fish beds present are fluvial. Species found are mixed. The location is significant for Sabrinacanthus arcuatus.