34-539: Wallace Statue may refer to the following monuments in Scotland: Wallace Monument , Stirling, which has at its corner a statue of Wallace Statue of William Wallace, Aberdeen Statue of William Wallace, Bemersyde See also [ edit ] William Wallace National Monument of Scotland , Edinburgh Wallace's Monument, Ayrshire William Wallace Monument at Elderslie Topics referred to by
68-470: A thin section using a method like the Gazzi-Dickinson Method . This yields the relative percentages of quartz, feldspar, and lithic grains and the amount of clay matrix. The composition of a sandstone can provide important information on the genesis of the sediments when used with a triangular Q uartz, F eldspar, L ithic fragment ( QFL diagrams ). However, geologist have not been able to agree on
102-478: A sandstone goes through as the degree of kinetic processing of the sediments increases. Dott's (1964) sandstone classification scheme is one of many such schemes used by geologists for classifying sandstones. Dott's scheme is a modification of Gilbert's classification of silicate sandstones, and it incorporates R.L. Folk's dual textural and compositional maturity concepts into one classification system. The philosophy behind combining Gilbert's and R. L. Folk's schemes
136-459: A set of boundaries separating regions of the QFL triangle. Visual aids are diagrams that allow geologists to interpret different characteristics of a sandstone. For example, a QFL chart can be marked with a provenance model that shows the likely tectonic origin of sandstones with various compositions of framework grains. Likewise, the stage of textural maturity chart illustrates the different stages that
170-445: A twofold classification: Cement is what binds the siliciclastic framework grains together. Cement is a secondary mineral that forms after deposition and during burial of the sandstone. These cementing materials may be either silicate minerals or non-silicate minerals, such as calcite. Sandstone that becomes depleted of its cement binder through weathering gradually becomes friable and unstable. This process can be somewhat reversed by
204-537: Is 67-metre (220-foot) tall, took eight years to build. It was completed in 1869 and cost £18,000 (about £1.8million in 2024). The monument is open to the general public. Visitors climb the 246-step spiral staircase to the viewing gallery inside the monument's crown, which provides expansive views of the Ochil Hills and the Forth Valley . A number of artifacts believed to have belonged to Wallace are on display inside
238-837: Is a distinction that can be recognized in the field . In turn, the distinction between an orthoquartzite and a metaquartzite is the onset of recrystallization of existing grains. The dividing line may be placed at the point where strained quartz grains begin to be replaced by new, unstrained, small quartz grains, producing a mortar texture that can be identified in thin sections under a polarizing microscope. With increasing grade of metamorphism, further recrystallization produces foam texture , characterized by polygonal grains meeting at triple junctions, and then porphyroblastic texture , characterized by coarse, irregular grains, including some larger grains ( porphyroblasts .) Sandstone has been used since prehistoric times for construction, decorative art works and tools. It has been widely employed around
272-546: Is composed of quartz or feldspar , because they are the most resistant minerals to the weathering processes at the Earth's surface. Like uncemented sand , sandstone may be imparted any color by impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Because sandstone beds can form highly visible cliffs and other topographic features, certain colors of sandstone have become strongly identified with certain regions, such as
306-577: Is different from Wikidata All article disambiguation pages All disambiguation pages Wallace Monument The National Wallace Monument (generally known as the Wallace Monument ) is a 67 m (220 ft) tower on the shoulder of the Abbey Craig , a hilltop overlooking Stirling in Scotland. It commemorates Sir William Wallace , a 13th- and 14th-century Scottish hero. The tower
340-523: Is likely formed during eogenesis. Deeper burial is accompanied by mesogenesis , during which most of the compaction and lithification takes place. Compaction takes place as the sand comes under increasing pressure from overlying sediments. Sediment grains move into more compact arrangements, ductile grains (such as mica grains) are deformed, and pore space is reduced. In addition to this physical compaction, chemical compaction may take place via pressure solution . Points of contact between grains are under
374-416: Is open to the public for an admission fee. Visitors approach by foot from the base of the crag on which it stands. On entry there are 246 steps to the final observation platform, with three exhibition rooms within the body of the tower. The tower is not accessible to disabled visitors. The tower was constructed following a fundraising campaign, which accompanied a resurgence of Scottish national identity in
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#1733085859004408-431: Is redeposited in the unstrained pore spaces. Mechanical compaction takes place primarily at depths less than 1,000 meters (3,300 ft). Chemical compaction continues to depths of 2,000 meters (6,600 ft), and most cementation takes place at depths of 2,000–5,000 meters (6,600–16,400 ft). Unroofing of buried sandstone is accompanied by telogenesis , the third and final stage of diagenesis. As erosion reduces
442-443: Is that it is better able to "portray the continuous nature of textural variation from mudstone to arenite and from stable to unstable grain composition". Dott's classification scheme is based on the mineralogy of framework grains, and on the type of matrix present in between the framework grains. In this specific classification scheme, Dott has set the boundary between arenite and wackes at 15% matrix. In addition, Dott also breaks up
476-514: The 19th century. The campaign was begun in Glasgow in 1851 by Rev Charles Rogers , who was joined by William Burns . Burns took sole charge from around 1855 following Rogers' resignation. In addition to public subscription, it was partially funded by contributions from a number of foreign donors, including Italian national leader Giuseppe Garibaldi . The Victorian Gothic monument was created by architect John Thomas Rochead . The foundation stone
510-400: The actor who played William Wallace in the film. Church leased the statue to Stirling Council, who in 1997 installed it in the car park of the visitor centre at the foot of the craig. The statue was deeply unpopular, being described as "among the most loathed pieces of public art in Scotland". and was regularly vandalised before being placed in a cage to prevent further damage. Plans to expand
544-491: The application of tetraethyl orthosilicate (Si(OC 2 H 5 ) 4 ) which will deposit amorphous silicon dioxide between the sand grains. The reaction is as follows. Pore space includes the open spaces within a rock or a soil. The pore space in a rock has a direct relationship to the porosity and permeability of the rock. The porosity and permeability are directly influenced by the way the sand grains are packed together. Sandstones are typically classified by point-counting
578-468: The common minerals most resistant to weathering processes at the Earth's surface, as seen in the Goldich dissolution series . Framework grains can be classified into several different categories based on their mineral composition: Matrix is very fine material, which is present within interstitial pore space between the framework grains. The nature of the matrix within the interstitial pore space results in
612-456: The depositional environment, older sand is buried by younger sediments, and it undergoes diagenesis . This mostly consists of compaction and lithification of the sand. Early stages of diagenesis, described as eogenesis , take place at shallow depths (a few tens of meters) and are characterized by bioturbation and mineralogical changes in the sands, with only slight compaction. The red hematite that gives red bed sandstones their color
646-407: The depth of burial, renewed exposure to meteoric water produces additional changes to the sandstone, such as dissolution of some of the cement to produce secondary porosity . Framework grains are sand-sized (0.0625-to-2-millimeter (0.00246 to 0.07874 in) diameter) detrital fragments that make up the bulk of a sandstone. Most framework grains are composed of quartz or feldspar , which are
680-446: The different types of framework grains that can be present in a sandstone into three major categories: quartz, feldspar, and lithic grains. When sandstone is subjected to the great heat and pressure associated with regional metamorphism , the individual quartz grains recrystallize, along with the former cementing material, to form the metamorphic rock called quartzite . Most or all of the original texture and sedimentary structures of
714-433: The greatest strain, and the strained mineral is more soluble than the rest of the grain. As a result, the contact points are dissolved away, allowing the grains to come into closer contact. Lithification follows closely on compaction, as increased temperatures at depth hasten deposition of cement that binds the grains together. Pressure solution contributes to cementing, as the mineral dissolved from strained contact points
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#1733085859004748-442: The hardness of individual grains, uniformity of grain size and friability of their structure, some types of sandstone are excellent materials from which to make grindstones , for sharpening blades and other implements. Non-friable sandstone can be used to make grindstones for grinding grain, e.g., gritstone . A type of pure quartz sandstone, orthoquartzite, with more of 90–95 percent of quartz, has been proposed for nomination to
782-543: The head of the decapitated governor of York. In April 2016, it was reported in local press that the statue might be moved to Ardrossan 's old Barony Church. In September 2021, it was moved to Glebe Park stadium in Brechin . Sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks . Most sandstone
816-678: The monument, including the Wallace Sword , a 1.63 m (5 ft 4 in) longsword weighing almost three kilograms (seven pounds). Inside is also a Hall of Heroes , a series of busts of famous Scots, effectively a small national Hall of Fame . The heroes are Robert the Bruce , George Buchanan , John Knox , Allan Ramsay , Robert Burns , Robert Tannahill , Adam Smith , James Watt , Sir Walter Scott , William Murdoch , Sir David Brewster , Thomas Carlyle , Hugh Miller , Thomas Chalmers , David Livingstone , and W. E. Gladstone . In 2017 it
850-493: The much lower temperatures and pressures associated with diagenesis of sedimentary rock, but diagenesis has cemented the rock so thoroughly that microscopic examination is necessary to distinguish it from metamorphic quartzite. The term orthoquartzite is used to distinguish such sedimentary rock from metaquartzite produced by metamorphism. By extension, the term orthoquartzite has occasionally been more generally applied to any quartz-cemented quartz arenite . Orthoquartzite (in
884-464: The narrow sense) is often 99% SiO 2 with only very minor amounts of iron oxide and trace resistant minerals such as zircon , rutile and magnetite . Although few fossils are normally present, the original texture and sedimentary structures are preserved. The typical distinction between a true orthoquartzite and an ordinary quartz sandstone is that an orthoquartzite is so highly cemented that it will fracture across grains, not around them. This
918-638: The product of physical and chemical weathering of bedrock. Weathering and erosion are most rapid in areas of high relief, such as volcanic arcs , areas of continental rifting , and orogenic belts . Eroded sand is transported by rivers or by the wind from its source areas to depositional environments where tectonics has created accommodation space for sediments to accumulate. Forearc basins tend to accumulate sand rich in lithic grains and plagioclase . Intracontinental basins and grabens along continental margins are also common environments for deposition of sand. As sediments continue to accumulate in
952-704: The red rock deserts of Arches National Park and other areas of the American Southwest . Rock formations composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs . Quartz-bearing sandstone can be changed into quartzite through metamorphism , usually related to tectonic compression within orogenic belts . Sandstones are clastic in origin (as opposed to either organic , like chalk and coal , or chemical , like gypsum and jasper ). The silicate sand grains from which they form are
986-425: The same term [REDACTED] This disambiguation page lists articles associated with the title Wallace Statue . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Wallace_Statue&oldid=1098325392 " Category : Disambiguation pages Hidden categories: Short description
1020-417: The sandstone are erased by the metamorphism. The grains are so tightly interlocked that when the rock is broken, it fractures through the grains to form an irregular or conchoidal fracture. Geologists had recognized by 1941 that some rocks show the macroscopic characteristics of quartzite, even though they have not undergone metamorphism at high pressure and temperature. These rocks have been subject only to
1054-416: The visitor centre, including a new restaurant and reception, led to the unpopular statue's removal in 2008. It was returned to Church, who, after an unsuccessful attempt to sell it at auction, reportedly offered it to Donald Trump 's Menie estate golf resort. However, it remained in the garden of the sculptor's home, where it was incorporated into a replica of a castle, and with additions to it that included
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1088-612: The world in constructing temples, churches, homes and other buildings, and in civil engineering . Although its resistance to weathering varies, sandstone is easy to work. That makes it a common building and paving material, including in asphalt concrete . However, some types that have been used in the past, such as the Collyhurst sandstone used in North West England , have had poor long-term weather resistance, necessitating repair and replacement in older buildings. Because of
1122-460: Was announced that Mary Slessor and Maggie Keswick Jencks would be the first heroines to be celebrated in the hall. The original Victorian statue of Wallace stands on the corner of the monument and is by the Edinburgh sculptor David Watson Stevenson . In 1996 Tom Church carved a statue of Wallace called "Freedom", which was inspired by the film Braveheart . It has the face of Mel Gibson ,
1156-546: Was laid in 1861 by the Duke of Atholl in his role as Grand Master Mason of Scotland, with a short speech given by Sir Archibald Alison . Abbey Craig, a volcanic crag above Cambuskenneth Abbey , was chosen for the location of the tower because it the location from which Wallace was said to have watched the gathering of the army of King Edward I of England just before the Battle of Stirling Bridge in 1297. The sandstone tower, which
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