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Eday Group
The Eday Group is a Devonian lithostratigraphic group (a sequence of rock strata) in Orkney, northern Scotland. The name is derived from the island of Eday where the strata are exposed in coastal cliffs. Outcrops These rocks are exposed throughout Orkney, notably in coastal cliffs of Eday and western Sanday, South Ronaldsay and the Deerness peninsula of Mainland. There are spectacular exposures of the Hoy Sandstone Formation and particularly the Trowie Glen Sandstone Member in the precipitous cliffs of Hoy's west coast. Lithology and stratigraphy The Group comprises the Upper Eday Sandstone Formation, Eday Marl Formation, Middle Eday Sandstone Formation, Eday Flagstone Formation, Lower Eday Sandstone Formation and the Hoy Sandstone Formation laid down in the shallow Orcadian Basin during the Givetian stage of the Devonian period. The sediments vary from fluvial to lacustrine to lagoonal. On the island of Hoy Hoy ( sco, Hoy; from Norse , meaning "high island") is an is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Group (stratigraphy)
In geology, a group is a lithostratigraphic unit consisting of a series of related formations that have been classified together to form a group. Formations are the fundamental unit of stratigraphy. Groups may sometimes be combined into supergroups. Groups are useful for showing relationships between formations, and they are also useful for small-scale mapping or for studying the stratigraphy of large regions. Geologists exploring a new area have sometimes defined groups when they believe the strata within the groups can be divided into formations during subsequent investigations of the area. It is possible for only some of the strata making up a group to be divided into formations. An example of a group is the Glen Canyon Group, which includes (in ascending order) the Wingate Sandstone, the Moenave Formation, the Kayenta Formation, and the Navajo Sandstone. Each of the formations can be distinguished from its neighbor by its lithology, but all were deposited in the same vast ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 either '' bedding surfaces'' or ''bedding planes''.Salvador, A. ed., 1994. ''International stratigraphic guide: a guide to stratigraphic classification, terminology, and procedure. 2nd ed.'' Boulder, Colorado, The Geological Society of America, Inc., 215 pp. . Prior to the publication of the International Stratigraphic Guide, older publications have defined a stratum as either being either equivalent to a single bed or composed of a number of beds; as a layer greater than 1 cm in thickness and constituting a part of a bed; or a general term that includes both ''bed'' and ''lamina''.Neuendorf, K.K.E., Mehl, Jr., J.P., and Jackson, J.A. , eds., 2005. ''Glossary of Geology'' 5th ed. Alexandria, Virginia, American Geological Institute. 779 pp. . ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian System Of Europe
The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. The arthropod groups of myriapods, arachnids and hexapods also became well-established early in this period, after starting their expansion to land at least from the Ordovician period. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fishes. The placoderms began domi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologic Formations Of Scotland
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes of Earth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Groups Of The United Kingdom
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes of Earth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Fossiliferous Stratigraphic Units In Scotland
See also *Lists of fossiliferous stratigraphic units in Europe *Lists of fossiliferous stratigraphic units in the United Kingdom References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Scotland Scotland Scotland (, ) is a country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to the ... Stratigraphy of Scotland Scotland geography-related lists United Kingdom geology-related lists Fossils of Scotland ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orcadian Basin
The Orcadian Basin is a sedimentary basin of Devonian age that formed mainly as a result of extensional tectonics in northeastern Scotland after the end of the Caledonian orogeny. During part of its history, the basin was filled by a lake now known as ''Lake Orcadie''. In that lacustrine environment, a sequence of finely bedded sedimentary rocks was deposited, containing well-preserved fish fossils, with alternating layers of mudstone and coarse siltstone to very fine sandstone. These flagstones split easily along the bedding and have been used as building material for thousands of years. The deposits of the Orcadian Basin form part of the Old Red Sandstone (ORS). The lithostratigraphic terms lower, middle and upper ORS, however, do not necessarily match exactly with sediments of lower, middle and upper Devonian age, as the base of the ORS is now known to be in the Silurian and the top in the Carboniferous. Extent The exact extent of the Orcadian Basin is uncertain due to later tecto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mainland, Orkney
The Mainland, also known as Hrossey and Pomona, is the main island of Orkney, Scotland. Both of Orkney's burghs, Kirkwall and Stromness, lie on the island, which is also the heart of Orkney's ferry and air connections. Seventy-five per cent of Orkney's population live on the island, which is more densely populated than the other islands of the archipelago. The lengthy history of the island's occupation has provided numerous important archaeological sites and the sandstone bedrock provides a platform for fertile farmland. There is an abundance of wildlife, especially seabirds. Etymology The name Mainland is a corruption of the Old Norse . Formerly the island was also known as meaning 'horse island'. The island is sometimes referred to as '' Pomona'' (or ''Pomonia''), a name that stems from a 16th-century mis-translation by George Buchanan.Buchanan, George (1582''Rerum Scoticarum Historia: The First Book''The University of California, Irvine. Revised 8 March 2003. Retrieved 4 Oc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deerness
Deerness (, , Old Norse: ''Dyrnes'') is a ''quoad sacra'' parish (i.e. one created and functioning for ecclesiastical purposes only) and peninsula in Mainland, Orkney, Scotland. It is about south east of Kirkwall. Deerness forms a part of the civil parish of St. Andrews and Deerness. There is a shop/post office and a community centre and the Deerness Distillery. Deerness is connected to the rest of the Orkney Mainland by a narrow isthmus, known as Dingieshowe. Deerness parish consists chiefly of the peninsula, but also takes in its surrounding islets of Copinsay, the Horse of Copinsay and Corn Holm. The Brough of Deerness is the site of an early Christian monastery near the north eastern tip of the peninsula. The Gloup is a sea-cave approximately long and deep just south of the Brough. The Crown of London shipwreck The Covenanter's Memorial at Deerness, commemorating the loss in a shipwreck of 200 Covenanters en route to the New World of America (as a punishment), was la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Ronaldsay
South Ronaldsay (, also , sco, Sooth Ronalshee) is one of the Orkney Islands off the north coast of Scotland. It is linked to the Orkney Mainland by the Churchill Barriers, running via Burray, Glimps Holm and Lamb Holm. Name Along with North Ronaldsay, the island is named after St Ronald. The original name from which the English name derives, ''Rǫgnvaldsey'', comes from Old Norse; ''Rǫgnvalds'' ("Ronald's") + ''ey'' ("island"). Geography and geology With an area of , it is the fourth largest of the Orkney islands after The Mainland, Hoy and Sanday. Ferries sail from Burwick on the island to John o' Groats on the Scottish mainland and from St Margaret's Hope to Gills Bay.Wenham, Sheena "The South Isles" in Omand (2003) p. 212. South Ronaldsay's main village is St Margaret's Hope, Orkney's third largest settlement. It is named either after Margaret, Maid of Norway, the heir to the Scottish throne who died in Orkney age sevenWenham, Sheena "The South Isles" in Omand (200 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sanday, Orkney
Sanday (, sco, Sandee) is one of the inhabited islands of Orkney that lies off the north coast of mainland Scotland. With an area of , it is the third largest of the Orkney Islands.Haswell-Smith (2004) p. 334. The main centres of population are Lady Village and Kettletoft. Sanday can be reached by Orkney Ferries or by plane (Sanday Airport) from Kirkwall on the Orkney Mainland. On Sanday, an on-demand public minibus service allows connecting to the ferry. Etymology The Picts were the pre-Norse inhabitants of Sanday but very few placenames remain from this period. The Norse named the island or because of the predominance of sandy beaches and this became "Sanday" during the Scots- and English-speaking periods. The similarly named Sandoy is in the Faroe Islands. Many names of places and natural features derive from Old Norse. According to Dorward (1995), the placename ''Kettletoft'' means ' Kettil's croft' although ''toft'' in this context may mean 'abandoned site of house' fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratum
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 either '' bedding surfaces'' or ''bedding planes''.Salvador, A. ed., 1994. ''International stratigraphic guide: a guide to stratigraphic classification, terminology, and procedure. 2nd ed.'' Boulder, Colorado, The Geological Society of America, Inc., 215 pp. . Prior to the publication of the International Stratigraphic Guide, older publications have defined a stratum as either being either equivalent to a single bed or composed of a number of beds; as a layer greater than 1 cm in thickness and constituting a part of a bed; or a general term that includes both ''bed'' and ''lamina''.Neuendorf, K.K.E., Mehl, Jr., J.P., and Jackson, J.A. , eds., 2005. ''Glossary of Geology'' 5th ed. Alexandria, Virginia, American Geological Institute. 779 pp. . ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
