The Arbuthnott-Garvock Group (or Arbuthnot-Garvock 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 central

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 ...

. The name is derived from the village of

Arbuthnott Arbuthnott (, "mouth of the Buadhnat") is a hamlet and parish in the Howe of the Mearns, a low-lying agricultural district of Aberdeenshire, Scotland. It is located on the B967, east of Fordoun (on the A90) and north-west of Inverbervie (on ...

Aberdeenshire Aberdeenshire (; ) is one of the 32 Subdivisions of Scotland#council areas of Scotland, council areas of Scotland. It takes its name from the Shires of Scotland, historic county of Aberdeenshire (historic), Aberdeenshire, which had substantial ...

and the Hill of Garvock near

Laurencekirk Laurencekirk (, , ), locally known as Lournie or simply 'The Kirk', is a small town in the historic county of Kincardineshire, Scotland, just off the A90 Dundee to Aberdeen main road. It is administered as part of Aberdeenshire. It is the l ...

. The group comprises the previously separate overlying Garvock Group and the underlying Arbuthnott Group.

Outcrops

These rocks are exposed in the west in southern

Kintyre Kintyre (, ) is a peninsula in western Scotland, in the southwest of Argyll and Bute. The peninsula stretches about , from the Mull of Kintyre in the south to East Loch Tarbert, Argyll, East and West Loch Tarbert, Argyll, West Loch Tarbert in t ...

between

Campbeltown Campbeltown (; or ) is a town and former royal burgh in Argyll and Bute, Scotland. It lies by Campbeltown Loch on the Kintyre Peninsula. Campbeltown became an important centre for Scotch whisky, and a busy fishing port. The 2018 populatio ...

and

Southend Southend-on-Sea (), commonly referred to as Southend (), is a coastal city and unitary authorities of England, unitary authority area with Borough status in the United Kingdom, borough status in south-eastern Essex, England. It lies on the nor ...

and in an arcuate belt between

Machrie Machrie () is a village on the Isle of Arran in the Firth of Clyde, Scotland. Machrie Bay can be found on the West Coast. The village is within the parish of Kilmory. It is most well known for its Standing Stones that are a local tourist attrac ...

and

Sannox Sannox () is a village on the Isle of Arran, Scotland. The village is within the parish of Kilbride. The name comes from the name the Vikings gave to the area, ''Sandvik'', meaning the Sandy Bay. History Within North Glen Sannox it is possible ...

on the

Isle of Arran The Isle of Arran (; ) or simply Arran is an island off the west coast of Scotland. It is the largest island in the Firth of Clyde and the seventh-largest Scottish island, at . Counties of Scotland, Historically part of Buteshire, it is in the ...

. They occur in a southwest–northeast trending belt parallel to and just south of the

Highland Boundary Fault The Highland Boundary Fault is a major fault zone that traverses Scotland from Arran and Helensburgh on the west coast to Stonehaven in the east. It separates two different geological terranes which give rise to two distinct physiographic ter ...

between

Helensburgh Helensburgh ( ; ) is a town on the north side of the Firth of Clyde in Scotland, situated at the mouth of the Gareloch. Historically in Dunbartonshire, it became part of Argyll and Bute following local government reorganisation in 1996. Histo ...

and Blairgowrie via

Aberfoyle Aberfoyle may refer to: * Aberfoyle, County Londonderry, Northern Ireland *Aberfoyle, Stirling Aberfoyle () is a village in the historic county and registration county of Perthshire and the council area of Stirling, Scotland. The settlement li ...

and

Callander Callander (; ) is a small town in the council area of Stirling (district), Stirling in Scotland, situated on the River Teith. The town is located in the historic county of Perthshire and is a popular tourist stop to and from the Highlands. De ...

and as far as the southern edge of

Stonehaven Stonehaven ( ) is a town on the northeast coast of Scotland, south of Aberdeen. It had a population of 11,177 at th2022 Census Stonehaven was formerly the county town of Kincardineshire, succeeding the now abandoned town of Kincardine, Aberd ...

on the Scottish east coast. An extensive area in the east between Stonehaven and

Dundee Dundee (; ; or , ) is the List of towns and cities in Scotland by population, fourth-largest city in Scotland. The mid-year population estimate for the locality was . It lies within the eastern central Lowlands on the north bank of the Firt ...

is underlain by these rocks including the

Brechin Brechin (; ) is a town and former royal burgh in Angus, Scotland. Traditionally Brechin was described as a city because of its cathedral and its status as the seat of a pre-Scottish Reformation, Reformation Roman Catholic diocese (which contin ...

Forfar Forfar (; , ) is the county town of Angus, Scotland, and the administrative centre for Angus Council, with a new multi-million-pound office complex located on the outskirts of the town. As of 2021, the town had a population of 16,280. The town ...

and

Arbroath Arbroath () or Aberbrothock ( ) is a former royal burgh and the largest town in the Subdivisions of Scotland, council area of Angus, Scotland, Angus, Scotland, with a population of 23,902. It lies on the North Sea coast, some east-northeast of ...

areas. A further belt of country between Forfar and

Dunblane Dunblane (, ) is a town in the council area of Stirling in central Scotland, and inside the historic boundaries of the county of Perthshire. It is a commuter town, with many residents making use of good transport links to much of the Central Be ...

through

Perth Perth () is the list of Australian capital cities, capital city of Western Australia. It is the list of cities in Australia by population, fourth-most-populous city in Australia, with a population of over 2.3 million within Greater Perth . The ...

and extending into northern

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 ...

is underlain by these rocks.

Lithology and stratigraphy

The Group comprises numerous formations including the Catterline Conglomerate, Scone Sandstone, Craighall Conglomerate, Ruchil Flagstone and Craig of Monievreckie Conglomerate formations laid down during the

Lochkovian The Lochkovian is one of three faunal stages in the Early Devonian Epoch. It lasted from 419.2 ± 3.2 million years ago to 410.8 ± 2.8 million years ago. It marked the beginning of the Devonian Period, and was followed by the Pragian Stage. It is ...

Pragian The Pragian is one of three faunal stages in the Early Devonian Epoch. It lasted from 410.8 ± 2.8 million years ago to 407.6 ± 2.8 million years ago. It was preceded by the Lochkovian Stage and followed by the Emsian Stage. The most important ...

stages of the Devonian Period.British Geological Survey 1:50,000 scale geological map (Scotland) sheets

References

* {{Reflist Devonian System of Europe Geology of Scotland Geological groups of the United Kingdom Rock formations of Scotland Sandstone groups Mudstone groups Siltstone groups Conglomerate groups