Stidham Farm () is a 17.3
hectare
The hectare (; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100- metre sides (1 hm2), or 10,000 m2, and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is ...
geological Site of Special Scientific Interest
A Site of Special Scientific Interest (SSSI) in Great Britain or an Area of Special Scientific Interest (ASSI) in the Isle of Man and Northern Ireland is a conservation designation denoting a protected area in the United Kingdom and Isle o ...
near the town of
Keynsham,
Bath and North East Somerset
Bath and North East Somerset (B&NES) is a Unitary authorities of England, unitary authority district in England. Bath and North East Somerset Council was created on 1 April 1996 following the abolition of the county of Avon. It is part of the Cer ...
,
notified in 1991.
This site contains
Pleistocene
The Pleistocene ( , often referred to as the ''Ice age'') is the geological epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in ...
terrace-gravels of the
River Avon. At least of sandy gravels are recorded, consisting of
limestone
Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms whe ...
clasts
Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus,Essentials of Geology, 3rd Ed, Stephen Marshak, p. G-3 chunks, and smaller grains of rock broken off other rocks ...
mainly, but also with
Millstone Grit, Pennant
Sandstone
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks.
Most sandstone is composed of quartz or feldspar (both silicates ...
, flint and chert clasts. The site is of considerable importance for studies relating to the possible glaciation of the area, and of the terrace
stratigraphy, particularly as it is one of only two accessible terrace deposits in this part of the Avon valley.
English Nature citation sheet for the site
(accessed 13 July 2006)
References
{{SSSIs Avon geological
Sites of Special Scientific Interest in Avon
Sites of Special Scientific Interest notified in 1991