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Aust Cliff (grid reference ST565894) is a 5.3 hectare geological Site of Special Scientific Interest adjacent to the Severn Estuary, near the village of Aust, South Gloucestershire, notified in 1954. The Severn Bridge crosses the cliff.

Aust Cliff
Site of Special Scientific Interest
Aust Cliff is located in Gloucestershire
Aust Cliff
Location within Gloucestershire
Area of SearchAvon
Grid referenceST565894
Coordinates51°36′06″N 2°37′46″W / 51.60175°N 2.62947°W / 51.60175; -2.62947Coordinates: 51°36′06″N 2°37′46″W / 51.60175°N 2.62947°W / 51.60175; -2.62947
Area13.1 acres (0.053 km2; 0.0205 sq mi)
Notification1954 (1954)
Natural England website

Its SSSI designation is due to the presence of fossil beds. The site is famous for its Rhaetic bone bed, and is also the most productive locality in Britain for Triassic insects.

The lower part of the cliff is a red mudstone, with bands of nodules of pinkish-white alabaster. Above the red mudstone is green mudstone, followed by the Rhaetic bone bed at the base of a band of black shale. Above the shale are cream-coloured limestone beds.[1]


Pterosaurs of Aust Cliff
Taxa Abundance Notes Images


  1. D. macronyx[2]


  1. ^ The story of landscape and geology in South Gloucestershire Archived 2008-09-08 at the Wayback Machine p.16
  2. ^ a b Wellnhofer, Peter (1991). "Summary of Lower Jurassic Pterosaurs." The Illustrated Encyclopedia of Pterosaurs. London, UK: Salamander Books Limited. p. 79. ISBN 0-86101-566-5.

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