View allAll Photos Tagged quartzite
From Egypt
18th Dynasty, around 1350 BC
'He who cuts off the face of him who cuts off your face'
This inscription on the statue appears to identify it with Hapy the son of Horus. Yet this baboon still reminds of the Cynocephalus ape of Thoth.
Ancient Egyptians might identify the baboon with at least three main deities. The first was the sun-god, as baboons screech at sunrise. Religious papyri often depict baboons adoring the rising sun. The second deity, who this sculpture is normally thought to represent, is Thoth, the ibis-headed god of Hermopolis. Amenhotep III (1390-1352 BC), whose names are incised on the pedestal of this small figure, in fact set up four colossal baboon statues at Hermopolis, the centre of Thoth's cult.
However, the baboon is also associated with Hapy, one of the four sons of Horus. The inscription on this statue suggests that it might be Hapy who is represented here, as it bears the epithet 'He who cuts off the face of him who cuts off your face', which is usually identified with the guardian Hapy.
The figure is carved from the brown quartzite of Lower Egypt so favoured by Amenhotep III. It has been suggested that the statue may have come from Amenhotep's tomb, but divine statues in royal burials are more likely to have been made of wood. It seems more likely that this is one of the huge number of statues of deities made for Amenhotep's mortuary temple on the west bank of the Nile.
A.P. Kozloff and B.M. Bryan, Egypts dazzling sun: Amenhotep (Cleveland Museum of Art, 1992)
S. Quirke and A.J. Spencer, The British Museum book of anc (London, The British Museum Press, 1992)
British Museum
Room 4: Egyptian sculpture
www.britishmuseum.org/explore/highlights/highlight_object...
Fuchsitic quartzite in the Precambrian of Wyoming, USA.
The quartzite seen here is richly infused with greenish fuchsite (= chromian muscovite mica). This is a small abandoned quarry where flaggy rocks were excavated for use as decorative stones (see Harris, 2003, p. 9).
Geologic unit: Elmers Rock Greenstone Belt, Archean, 2.54+ Ga
Locality: small abandoned quarry ~0.5 miles north of Tunnel Road, west of Squaw Mountain & south-southeast of Government Peak, eastern flanks of the Laramie Range, far-eastern Albany County, WSW of the town of Wheatland, southeastern Wyoming, USA (vicinity of 41° 55' 00.40" North latitude, 105° 17' 48.53" West longitude)
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Reference cited:
Harris (2003) - Decorative stones of southern Wyoming. Wyoming State Geological Survey Public Information Circular 42.
American Granite™ Mosaic Veneer, Wall Stone, Roughly Squared Roughly Rectangular, South Bay Quartzite® Roughly Squared Roughly Rectangular, Wall Stone, Fieldstone Wall Stone
OLYMPUS DIGITAL CAMERA
From Port na Mheirlich.
A section of a beach pebble approximately 7mm x 5mm.
Quartzite vein through sedimentary rock with metamorphic changes.
In camera focus stacked.
Focus interval 1 of 10.
8 RAW images stacked in camera presented to save as a JPG.
Studio macro set up . Pebble facing mounted almost parallel to the sensor. LED lighting.
Quartzite from the Precambrian of the Transcontinental Arch, USA. (8.7 centimeters across at its widest)
Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event). Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism. Many metamorphic rocks have a foliated texture, but some are crystalline or glassy.
Quartzite is a common, crystalline-textured, intermediate- to high-grade metamorphic rock. It forms by metamorphism of quartzose sandstones or siltstones. Quartzite can be entirely composed of interlocking quartz crystals, or the original sand grains may still be visible. This rock is hard (H = 7), will not bubble in acid (unlike marble), and can be almost any color.
The term “quartzite” has been used in geology to refer to crystalline, quartzose metamorphic rocks and to hard, well-cemented quartzose sandstones that have not been subjected to metamorphism. It is difficult to not call hard, well-cemented sandstones “quartzite” - for example, the Clinch Quartzite in the Appalachian Mountains and the Eureka Quartzite of the Great Basin in western USA, but the Clinch and Eureka aren’t metamorphic rocks. The term "metaquartzite" has been used by some geologists to refer to crystalline-textured, quartzose rocks that have been metamorphosed. This implies that “quartzite” be restricted to well-cemented, non-metamorphosed sandstones. I don’t often see the term metaquartzite in the geologic literature.
The quartzite sample seen here is from the Precambrian-aged Sioux Quartzite, which outcrops in southeastern South Dakota and southwestern Minnesota. Despite being regionally metamorphed, the unit’s original sedimentary features, such as horizontal stratification, cross-bedding, and ripple marks, are still apparent in some outcrops.
The Sioux Quartzite is a erosion-resistant unit in a long-lived paleotopographic high called the Sioux tectonic core. This high has existed since Precambrian times and is part of a northeast-southwest trending series of paleotopographic highs & depressions known as the Transcontinental Arch, which extends from Arizona to Minnesota (see Carlson, 1999).
Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65 to 1.70 Ga
Locality: undetermined quarry; collected from railroad ballast at Missouri Valley, Iowa, USA
-----------------
Reference cited:
Carlson (1999) - Transcontinental Arch - a pattern formed by rejuvenation of local features across central North America. Tectonophysics 305: 225-233.
British Museum (Free Museum) London England, Bloomsbury District
Eighteenth Dynasty, about 1400 BC from Thebes
Quartzites in the Precambrian of South Dakota, USA.
Extensive outcrops of pinkish, Paleoproterozoic-aged quartzites are present at Falls Park along the Big Sioux River in the city of Sioux Falls, South Dakota. The quartzites here have nicely water-worn, sculpted surfaces with good, fluvially abraded polish in places. These rocks are part of the Sioux Quartzite, which consists of 1.65 to 1.70 billion year old metamorphosed sandstones. Despite the metamorphism, original sedimentary features such as horizontal stratification, cross-bedding, and ripple marks are still preserved.
The Sioux Quartzite is an erosion-resistant unit in America’s midcontinent. It has formed a long-lived paleotopographic high since Precambrian times - the Sioux tectonic core. This high is part of a northeast-to-southwest trending series of paleotopographic highs & depressions known as the Transcontinental Arch, which extends from Arizona to Minnesota (see Carlson, 1999).
Quarries of Sioux Quartzite occur in southeastern South Dakota and southwestern Minnesota. The rocks are used as building stone, road gravel, sidewalk and paving gravel, and erosion control material.
Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65-1.70 Ga
Locality: Falls Park, along the Big Sioux River in the town of Sioux Falls, southeastern South Dakota, USA
------------------
Reference cited:
Carlson (1999) - Transcontinental Arch - a pattern formed by rejuvenation of local features across central North America. Tectonophysics 305: 225-233.
Quartzite can be recognized by its crystalline texture and by the way it fractures.
NOTE: The photo is public domain. Please credit U.S. Forest Service when used.
The Dell Rapids Warming House is locally significant for its association with the historical themes of entertainment and recreation in the early twentieth century. At the time, ice skating was a popular national pastime and an integral part of life in Dell Rapids during the winter months. The community built the warming house out of local rose-colored quartzite, a distinctive stone that was long quarried for construction in southeastern South Dakota and integral to the area’s architectural and community development. On the interior, there was a large fireplace that served to warm up those who enjoyed time ice-skating on the river. Its construction date is estimated at about 1930. The Warming House was listed in the National Register of Historic Places on February 27, 2017.
Innovate Stones | Taj Mahal quartzite countertops. #granite #countertops #innovatestones #remodeling #kitchen
Quartzite (metaquartzite) is a quartzose, crystalline-textured, metamorphic rock. It forms by intermediate- to high-grade metamorphism of quartzose sandstones and siltstones.
Quartzite from the Precambrian of the Transcontinental Arch, USA. (7.6 centimeters across at its widest)
Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event). Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism. Many metamorphic rocks have a foliated texture, but some are crystalline or glassy.
Quartzite is a common, crystalline-textured, intermediate- to high-grade metamorphic rock. It forms by metamorphism of quartzose sandstones or siltstones. Quartzite can be entirely composed of interlocking quartz crystals, or the original sand grains may still be visible. This rock is hard (H = 7), will not bubble in acid (unlike marble), and can be almost any color.
The term “quartzite” has been used in geology to refer to crystalline, quartzose metamorphic rocks and to hard, well-cemented quartzose sandstones that have not been subjected to metamorphism. It is difficult to not call hard, well-cemented sandstones “quartzite” - for example, the Clinch Quartzite in the Appalachian Mountains and the Eureka Quartzite of the Great Basin in western USA, but the Clinch and Eureka aren’t metamorphic rocks. The term "metaquartzite" has been used by some geologists to refer to crystalline-textured, quartzose rocks that have been metamorphosed. This implies that “quartzite” be restricted to well-cemented, non-metamorphosed sandstones. I don’t often see the term metaquartzite in the geologic literature.
The quartzite sample seen here is from the Precambrian-aged Sioux Quartzite, which outcrops in southeastern South Dakota and southwestern Minnesota. Despite being regionally metamorphed, the unit’s original sedimentary features, such as horizontal stratification, cross-bedding, and ripple marks, are still apparent in some outcrops.
The Sioux Quartzite is a erosion-resistant unit in a long-lived paleotopographic high called the Sioux tectonic core. This high has existed since Precambrian times and is part of a northeast-southwest trending series of paleotopographic highs & depressions known as the Transcontinental Arch, which extends from Arizona to Minnesota (see Carlson, 1999).
Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65 to 1.70 Ga
Locality: undetermined quarry; collected from railroad ballast at Missouri Valley, Iowa, USA
-----------------
Reference cited:
Carlson (1999) - Transcontinental Arch - a pattern formed by rejuvenation of local features across central North America. Tectonophysics 305: 225-233.
From Egypt
18th Dynasty, around 1350 BC
'He who cuts off the face of him who cuts off your face'
This inscription on the statue appears to identify it with Hapy the son of Horus. Yet this baboon still reminds of the Cynocephalus ape of Thoth.
Ancient Egyptians might identify the baboon with at least three main deities. The first was the sun-god, as baboons screech at sunrise. Religious papyri often depict baboons adoring the rising sun. The second deity, who this sculpture is normally thought to represent, is Thoth, the ibis-headed god of Hermopolis. Amenhotep III (1390-1352 BC), whose names are incised on the pedestal of this small figure, in fact set up four colossal baboon statues at Hermopolis, the centre of Thoth's cult.
However, the baboon is also associated with Hapy, one of the four sons of Horus. The inscription on this statue suggests that it might be Hapy who is represented here, as it bears the epithet 'He who cuts off the face of him who cuts off your face', which is usually identified with the guardian Hapy.
The figure is carved from the brown quartzite of Lower Egypt so favoured by Amenhotep III. It has been suggested that the statue may have come from Amenhotep's tomb, but divine statues in royal burials are more likely to have been made of wood. It seems more likely that this is one of the huge number of statues of deities made for Amenhotep's mortuary temple on the west bank of the Nile.
A.P. Kozloff and B.M. Bryan, Egypts dazzling sun: Amenhotep (Cleveland Museum of Art, 1992)
S. Quirke and A.J. Spencer, The British Museum book of anc (London, The British Museum Press, 1992)
British Museum
Room 4: Egyptian sculpture
www.britishmuseum.org/explore/highlights/highlight_object...
The South Dakota State Penitentiary was added to the National Register in April 1978 and is located in Sioux Falls, Minnehaha County. Photographs from nomination.
The South Dakota State Penitentiary Historic Buildings consist of two building complexes and five individual structures. Because of different construction dates and uses, the historic part of the prison can be divided into fifteen sections. All but one structure, the green house, utilize Sioux Falls Quartzite as facing and most display a rock faced ashlar type of construction. These stone structures sit upon a steep hill that overlooks the city of Sioux Falls to the south, and the Big Sioux River runs just to the east. Stone walls, of up to forty-one feet in height surround all but the northeast section where a large metal fence is used. Construction of these walls occurred at various times including 1898, 1916 and 1956. All but three of the historic buildings are part of or contained within the walls.
One of the outside buildings is the two and one half story wardens house, constructed in 1884. Its architect W.L. Dow combined elements of Second Empire and Italianate designs. It has a bracketed hip roof, a high basement and quarry facing with the only exterior alteration being the screening in of the front porch. Another house outside of the walls is the deputy wardens. Constructed in 1903. Just outside the east wall is the building known as "The Cottage." It has two stories, a rectangular floor plan and red roofing tile. At the center of this historic area south façade is the Administration Building which is five stories tall, square shaped with blunted corners. It use to be only three stories high when constructed in 1881. Just to the northeast of this building is the one story body shop. This 1930 's building displays a rock rash type of veneer on one portion and rectangular cut stone on the other. The final three buildings are connected and run east to west. Construction dates of these two story structures are from 1905 to the 1920 's.
Each society establishes laws to protect its citizens, and there has to be institutions for the incarceration of those who break these codes. The South Dakota State Penitentiary has fulfilled this important governmental function since 1882. Many of the historic buildings are also significant architecturally not only in design but also for the display of craftsmanship in stone cutting and laying. All but one structure in the historic area is rock faced ashlar facing. This also shows a sympathy to the complex's design. The Dakota Territorial Congress passed a bill establishing the penitentiary and Sioux Falls citizens voted positively on a bond issue which allowed construction. After selecting an eighty-one acre site in 1881 overlooking the city, construction began that year. On December 13, 1882 the first inmates arrived at the prison from the Detroit House of Correction, Detroit, Michigan; this was where territorial prisoners had been kept. These men worked at a rock quarry in order to finish the United States wing of the penitentiary. Prisoners were the main labor source for constructing the institution's buildings and some municipal structures in Sioux Falls. In 1884 a shop, stables, hospital, the warden's house, and a portion of the stone wall were constructed. Several other forms of work have been done at the prison including monument works, twine plant, shirt factory, and making license plates. Over the years many buildings have been built and the older ones rebuilt. In the latter case the construction has varied from complete rebuilding, utilizing the same stone, to partial reconstruction. Architecturally the best structure is the 1884 wardens home which combines the elements of Second Empire and Italianate.
Masi Quartzite - fuchsitic quartzite from the Silurian of Norway.
Quartzite (metaquartzite) is a quartzose, crystalline-textured, metamorphic rock. It forms by intermediate- to high-grade metamorphism of quartzose sandstones and siltstones. The coloration in greenish quartzite is often from fuchsite, a chromian-rich variety of muscovite mica. In the decorative stone shown above, the fuchsite occurs in discrete, convoluted bands.
Locality: attributed to a quarry at Gaskabeivarri, near Masi, Kautokeino Municipality, Finnmark, northern Norway
Quartzite in the Precambrian of Wisconsin, USA.
The Baraboo Ranges of southern Wisconsin are dominated by a hard, erosion-resistant Precambrian metamorphic unit called the Baraboo Quartzite. These rocks were originally marine sandstones and have been subjected to metamorphism and structural folding. Original sedimentary structures are preserved, such as cross-bedding and ripple marks. Baraboo Quartzites vary in color from pinkish to dark reddish to grayish. During metamorphism, quartz overgrowths formed over the original quartz sand grains. Long-term, modern weathering can result in original sand grains being released.
This unit has economic significance - it has been quarried historically and in modern times. The quartzite is broken down into gravel-sized pieces for use as railroad ballast and erosion-control rip-rap.
Stratigraphy: Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga
Locality: roadcut on the western side of Rt. 136, across the road from Van Hise Rock, just north of the town of Rock Springs, North Range of the Baraboo Ranges, north-central Sauk County, southern Wisconsin, USA (43° 29’ 21.35” North, 89° 54’ 57.39” West)
From Egypt
18th Dynasty, around 1350 BC
'He who cuts off the face of him who cuts off your face'
This inscription on the statue appears to identify it with Hapy the son of Horus. Yet this baboon still reminds of the Cynocephalus ape of Thoth.
Ancient Egyptians might identify the baboon with at least three main deities. The first was the sun-god, as baboons screech at sunrise. Religious papyri often depict baboons adoring the rising sun. The second deity, who this sculpture is normally thought to represent, is Thoth, the ibis-headed god of Hermopolis. Amenhotep III (1390-1352 BC), whose names are incised on the pedestal of this small figure, in fact set up four colossal baboon statues at Hermopolis, the centre of Thoth's cult.
However, the baboon is also associated with Hapy, one of the four sons of Horus. The inscription on this statue suggests that it might be Hapy who is represented here, as it bears the epithet 'He who cuts off the face of him who cuts off your face', which is usually identified with the guardian Hapy.
The figure is carved from the brown quartzite of Lower Egypt so favoured by Amenhotep III. It has been suggested that the statue may have come from Amenhotep's tomb, but divine statues in royal burials are more likely to have been made of wood. It seems more likely that this is one of the huge number of statues of deities made for Amenhotep's mortuary temple on the west bank of the Nile.
A.P. Kozloff and B.M. Bryan, Egypts dazzling sun: Amenhotep (Cleveland Museum of Art, 1992)
S. Quirke and A.J. Spencer, The British Museum book of anc (London, The British Museum Press, 1992)
British Museum
Room 4: Egyptian sculpture
www.britishmuseum.org/explore/highlights/highlight_object...
Quartzite in the Precambrian of Wisconsin, USA. (geology hammer for scale)
The Baraboo Ranges of southern Wisconsin are dominated by a hard, erosion-resistant Precambrian metamorphic unit called the Baraboo Quartzite. These rocks were originally marine sandstones and have been subjected to metamorphism and structural folding. Original sedimentary structures are preserved, such as cross-bedding and ripple marks. Baraboo Quartzites vary in color from pinkish to dark reddish to grayish. During metamorphism, quartz overgrowths formed over the original quartz sand grains. Long-term, modern weathering can result in original sand grains being released.
This unit has economic significance - it has been quarried historically and in modern times. The quartzite is broken down into gravel-sized pieces for use as railroad ballast and erosion-control rip-rap.
Stratigraphy: Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga
Locality: roadcut on the western side of Rt. 136, across the road from Van Hise Rock, just north of the town of Rock Springs, North Range of the Baraboo Ranges, north-central Sauk County, southern Wisconsin, USA (43° 29’ 21.35” North, 89° 54’ 57.39” West)
File name: 06_10_022505
Title: Seneca Rocks, a towering mass of medina quartzite, east of Elkins
Created/Published: Pub. by The A. W. Smith News Agency, Charleston, W. Va. Tichnor Quality Views, Reg. U. S. Pat. Off. Made Only by Tichnor Bros., Inc., Boston, Mass.
Date issued: 1930 - 1945 (approximate)
Physical description: 1 print (postcard) : linen texture, color ; 3 1/2 x 5 1/2 in.
Genre: Postcards
Subject: Mountains
Notes: Title from item.
Collection: The Tichnor Brothers Collection
Location: Boston Public Library, Print Department
Rights: No known restrictions
Bow Fiddle Rock is a large rock formation about 50 feet high just off Scotland's Moray Coast at the village of Portknockie. The quartzite rock, a popular tourist attraction, is a large sea arch, which somewhat resembles the bow of a fiddle.
Quartzite from the Precambrian of the Transcontinental Arch, USA. (5.4 centimeters across at its widest)
Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event). Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism. Many metamorphic rocks have a foliated texture, but some are crystalline or glassy.
Quartzite is a common, crystalline-textured, intermediate- to high-grade metamorphic rock. It forms by metamorphism of quartzose sandstones or siltstones. Quartzite can be entirely composed of interlocking quartz crystals, or the original sand grains may still be visible. This rock is hard (H = 7), will not bubble in acid (unlike marble), and can be almost any color.
The term “quartzite” has been used in geology to refer to crystalline, quartzose metamorphic rocks and to hard, well-cemented quartzose sandstones that have not been subjected to metamorphism. It is difficult to not call hard, well-cemented sandstones “quartzite” - for example, the Clinch Quartzite in the Appalachian Mountains and the Eureka Quartzite of the Great Basin in western USA, but the Clinch and Eureka aren’t metamorphic rocks. The term "metaquartzite" has been used by some geologists to refer to crystalline-textured, quartzose rocks that have been metamorphosed. This implies that “quartzite” be restricted to well-cemented, non-metamorphosed sandstones. I don’t often see the term metaquartzite in the geologic literature.
The quartzite sample seen here is from the Precambrian-aged Sioux Quartzite, which outcrops in southeastern South Dakota and southwestern Minnesota. Despite being regionally metamorphed, the unit’s original sedimentary features, such as horizontal stratification, cross-bedding, and ripple marks, are still apparent in some outcrops.
The Sioux Quartzite is a erosion-resistant unit in a long-lived paleotopographic high called the Sioux tectonic core. This high has existed since Precambrian times and is part of a northeast-southwest trending series of paleotopographic highs & depressions known as the Transcontinental Arch, which extends from Arizona to Minnesota (see Carlson, 1999).
Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65 to 1.70 Ga
Locality: undetermined quarry; collected from railroad ballast at Missouri Valley, Iowa, USA
-----------------
Reference cited:
Carlson (1999) - Transcontinental Arch - a pattern formed by rejuvenation of local features across central North America. Tectonophysics 305: 225-233.
[Room 4: Egyptian sculpture]
Quartzite figure of a baboon
From Egypt
18th Dynasty, around 1350 BC
'He who cuts off the face of him who cuts off your face'
Ancient Egyptians might identify the baboon with at least three main deities. The first was the sun-god, as baboons screech at sunrise. Religious papyri often depict baboons adoring the rising sun. The second deity, who this sculpture is normally thought to represent, is Thoth, the ibis-headed god of Hermopolis. Amenhotep III (1390-1352 BC), whose names are incised on the pedestal of this small figure, in fact set up four colossal baboon statues at Hermopolis, the centre of Thoth's cult.
However, the baboon is also associated with Hapy, one of the four sons of Horus. The inscription on this statue suggests that it might be Hapy who is represented here, as it bears the epithet 'He who cuts off the face of him who cuts off your face', which is usually identified with the guardian Hapy.
The figure is carved from the brown quartzite of Lower Egypt so favoured by Amenhotep III. It has been suggested that the statue may have come from Amenhotep's tomb, but divine statues in royal burials are more likely to have been made of wood. It seems more likely that this is one of the huge number of statues of deities made for Amenhotep's mortuary temple on the west bank of the Nile.
- - Description taken from the British Museum WebSite
Quartzite in the Precambrian of South Dakota, USA.
Extensive outcrops of pinkish, Paleoproterozoic-aged quartzites are present at Falls Park along the Big Sioux River in the city of Sioux Falls, South Dakota. The quartzites here have nicely water-worn, sculpted surfaces. These rocks are part of the Sioux Quartzite, which consists of 1.65 to 1.70 billion year old metamorphosed sandstones. Despite the metamorphism, original sedimentary features such as horizontal stratification, cross-bedding, and ripple marks are still preserved.
The Sioux Quartzite is an erosion-resistant unit in America’s midcontinent. It has formed a long-lived paleotopographic high since Precambrian times - the Sioux tectonic core. This high is part of a northeast-to-southwest trending series of paleotopographic highs & depressions known as the Transcontinental Arch, which extends from Arizona to Minnesota (see Carlson, 1999).
Quarries of Sioux Quartzite occur in southeastern South Dakota and southwestern Minnesota. The rocks are used as building stone, road gravel, sidewalk and paving gravel, and erosion control material.
Stratigraphy: Sioux Quartzite, upper Paleoproterozoic, 1.65-1.70 Ga
Locality: Falls Park, near Sioux Falls along the Big Sioux River in the town of Sioux Falls, southeastern South Dakota, USA
------------------
Reference cited:
Carlson (1999) - Transcontinental Arch - a pattern formed by rejuvenation of local features across central North America. Tectonophysics 305: 225-233.
Otter Creek in the South Range of the Baraboo Ranges of Wisconsin, USA.
The gravel bars in this creek have abundant, large quartzite clasts derived from nearby outcrops of Baraboo Quartzite. The Baraboo Ranges of southern Wisconsin are dominated by this hard, erosion-resistant Precambrian metamorphic unit. These rocks were originally marine sandstones and have been subjected to metamorphism and structural folding. Original sedimentary structures are preserved, such as cross-bedding and ripple marks. Baraboo Quartzites vary in color from pinkish to dark reddish to grayish. During metamorphism, quartz overgrowths formed over the original quartz sand grains. Long-term, modern weathering can result in original sand grains being released.
This unit has economic significance - it has been quarried historically and in modern times. The quartzite is broken down into gravel-sized pieces for use as railroad ballast and erosion-control rip-rap.
Stratigraphy: Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga
Locality: Baxter Hollow (a little downstream of bridge over Otter Creek), South Range of the Baraboo Ranges, southeastern Sauk County, southern Wisconsin, USA