The Stratheden Group is a

Devonian The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per ...

lithostratigraphic Lithostratigraphy is a sub-discipline of stratigraphy, the geological science associated with the study of strata or rock layers. Major focuses include geochronology, comparative geology, and petrology. In general, strata are primarily igneous ...

group A group is a number of persons or things that are located, gathered, or classed together. Groups of people * Cultural group, a group whose members share the same cultural identity * Ethnic group, a group whose members share the same ethnic iden ...

(a sequence of

rock strata In geology and related fields, a stratum (: strata) is a layer of rock or sediment characterized by certain lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible surfaces known as ...

) in southern

Scotland Scotland is a Countries of the United Kingdom, country that is part of the United Kingdom. It contains nearly one-third of the United Kingdom's land area, consisting of the northern part of the island of Great Britain and more than 790 adjac ...

and northernmost

England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...

. Occasionally pebbly, this red-brown and yellow

sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...

dominated unit also contains

siltstone Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt. It is a form of mudrock with a low clay mineral content, which can be distinguished from shale by its lack of fissility. Although its permeabil ...

s and

mudstone Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from ''shale'' by its lack of fissility.Blatt, H., and R.J. Tracy, 1996, ''Petrology.'' New York, New York, ...

s. It is encountered in Arran in the west and across the Midland Valley to the northeastern parts of

Fife Fife ( , ; ; ) is a council areas of Scotland, council area and lieutenancy areas of Scotland, lieutenancy area in Scotland. A peninsula, it is bordered by the Firth of Tay to the north, the North Sea to the east, the Firth of Forth to the s ...

in the east. The name is derived from Stratheden in Fife. The rocks of the Stratheden Group have also previously been referred to as the Upper Old Red Sandstone. It unconformably overlies a variety of other rock sequences including the Strathmore Group around

Dumbarton Dumbarton (; , or ; or , meaning 'fort of the Britons (historical), Britons') is a town in West Dunbartonshire, Scotland, on the north bank of the River Clyde where the River Leven, Dunbartonshire, River Leven flows into the Clyde estuary. ...

Stirling Stirling (; ; ) is a City status in the United Kingdom, city in Central Belt, central Scotland, northeast of Glasgow and north-west of Edinburgh. The market town#Scotland, market town, surrounded by rich farmland, grew up connecting the roya ...

and Arran and the Arbuthnott-Garvock Group in Fife and the

Kinross Kinross (, ) is a burgh in Perth and Kinross, Scotland, around south of Perth, Scotland, Perth and around northwest of Edinburgh. It is the traditional county town of the Counties of Scotland, historic county of Kinross-shire. History Kinro ...

area.

References

* {{Refend Silurian System of Europe Geology of England Geology of Scotland Geological groups of the United Kingdom Sandstone groups Mudstone groups Siltstone groups Conglomerate groups