Lydney Cliff

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Lydney Cliff
Site of Special Scientific Interest
Gloucestershire UK location map.svg
Red pog.svg
Location within Gloucestershire
Area of Search Gloucestershire
Grid reference SO654020
Coordinates 51°42′58″N2°30′05″W / 51.716106°N 2.501503°W / 51.716106; -2.501503 Coordinates: 51°42′58″N2°30′05″W / 51.716106°N 2.501503°W / 51.716106; -2.501503
InterestGeological
Area8.0hectare
Notification 1990
Natural England website

Lydney Cliff (grid reference SO654020 ) is a 8.0-hectare (20-acre) geological Site of Special Scientific Interest in Gloucestershire, notified in 1990. Part of the site is included in the Severn Estuary SSSI. [1] [2]

Ordnance Survey National Grid System of geographic grid references used in Great Britain

The Ordnance Survey National Grid reference system is a system of geographic grid references used in Great Britain, distinct from latitude and longitude. It is often called British National Grid (BNG).

Gloucestershire County of England

Gloucestershire is a county in South West England. The county comprises part of the Cotswold Hills, part of the flat fertile valley of the River Severn, and the entire Forest of Dean.

Severn Estuary the estuary of the River Severn, the longest river in Great Britain; mouth of the Severn, Wye, Usk, and the Bristol Avon

The Severn Estuary is the estuary of the River Severn, the longest river in Great Britain. It is the confluence of four major rivers, being the Severn, Wye, Usk and Avon, and other smaller rivers. Its high tidal range, approximately 50 feet (15 m), means that it has been at the centre of discussions in the UK regarding renewable energy.

Contents

Geology

The site has exposures in the Raglan Marls (topmost) of the Lower Devonian time period (up to the level of the Psammosteus Limestone). 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 (below the Psammosteus Limestone). The site has contributed significantly to the geological record (for calcrete soils). [1]

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. [1]

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References

SSSI Source


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