The Magnesian Conglomerate is a geological

formation Formation may refer to: Linguistics * Back-formation, the process of creating a new lexeme by removing or affixes * Word formation, the creation of a new word by adding affixes Mathematics and science * Cave formation or speleothem, a secondar ...

Clifton, Bristol Clifton is both a suburb of Bristol, England, and the name of one of the city's thirty-five council wards. The Clifton ward also includes the areas of Cliftonwood and Hotwells. The eastern part of the suburb lies within the ward of Clifton Do ...

England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...

(originally Avon),

Gloucestershire Gloucestershire ( abbreviated Glos) 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. The county town is the city of Gl ...

and southern

Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...

, present in Tytherington,

Durdham Down Durdham Down is an area of public open space in Bristol, England. With its neighbour Clifton Down to the southwest, it constitutes a area known as The Downs, much used for leisure including walking, jogging and team sports. Its exposed positio ...

and

Cromhall Quarry Cromhall is a village in South Gloucestershire, England. It is located between Bagstone and Charfield on the B4058, and also borders Leyhill. The parish population taken at the 2011 census was 1,231. Location Cromhall is about from Falfield on ...

. It dates back to the

Rhaetian The Rhaetian is the latest age of the Triassic Period (in geochronology) or the uppermost stage of the Triassic System (in chronostratigraphy). It was preceded by the Norian and succeeded by the Hettangian (the lowermost stage or earliest age ...

stage of the

Late Triassic The Late Triassic is the third and final epoch (geology), epoch of the Triassic geologic time scale, Period in the geologic time scale, spanning the time between annum, Ma and Ma (million years ago). It is preceded by the Middle Triassic Epoch ...

,Magnesian Conglomerate
in the

Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database (PBDB) originated in the NCEAS-funded Phanerozoic Marine Pale ...

Weishampel et al., 2004, pp. 521–525 although it may be as old as the

Norian The Norian is a division of the Triassic Period. It has the rank of an age (geochronology) or stage (chronostratigraphy). It lasted from ~227 to million years ago. It was preceded by the Carnian and succeeded by the Rhaetian. Stratigraphic defi ...

stage of the Late Triassic and as young as the

Hettangian The Hettangian is the earliest age and lowest stage of the Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (My ...

stage of the

Early Jurassic The Early Jurassic Epoch (geology), Epoch (in chronostratigraphy corresponding to the Lower Jurassic series (stratigraphy), Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic-J ...

. This formation was first discovered in autumn 1834 and was studied in 1836 by Henry Riley and

Samuel Stutchbury Samuel Stutchbury (15 January 1798 – 12 February 1859) was an English naturalist and geologist. Alongside Henry Riley, Stutchbury was the co-discoverer of ''Thecodontosaurus'', which in 1836 was the fourth dinosaur genus to be named. He also p ...

.Riley & Stutchbury, 1836 The

Avon Fissure Fill The Avon Fissure Fill, also known as the Bristol Fissure Fill or Tytherington Fissure Fill, is a fissure fill in Avon, England (now Bristol) which dates variously from the Norian and Rhaetian stages of the Late Triassic, or possibly as late as t ...

is probably the same formation as the Magnesian Conglomerate.Magnesian Conglomerate
in the

Vertebrate paleofauna

References

Bibliography

* * * {{cite LSA , last=Riley , first=H. , last2=Stutchbury , first2=S. , year=1836 , title=A description of various fossil remains of three distinct saurian animals discovered in the autumn of 1834 in the Magnesian Conglomerate on Durdham Down near Bristol , journal= Proceedings of the Geological Society , volume=2 , pages=397–399

External links

British Geological Survey Lexicon of Named Rock Units
Geologic formations of England Triassic System of Europe Triassic England Rhaetian Stage Conglomerate formations Limestone formations Fossiliferous stratigraphic units of Europe Paleontology in England Formations

Vertebrate paleofauna

See also

References

Bibliography

Further reading

External links