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Chert (/ tʃ ɜːr t /) is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, [1] the mineral form of silicon dioxide (SiO 2). [2] Chert is characteristically of biological origin, but may also occur inorganically as a chemical precipitate or a diagenetic replacement, as in petrified wood.
Cher (/ ʃ ɛər / SHAIR; born Cheryl Sarkisian; [a] May 20, 1946) is an American singer, actress and television personality. Dubbed the "Goddess of Pop", she is known for her androgynous contralto voice, multifaceted career and bold visual presentation, while cultivating a screen persona that mirrors her public image by often portraying strong-willed, independent and outspoken women.
Cher performing in London during her Here We Go Again Tour in October 2019.. American entertainer Cher has recorded songs for 27 studio albums and four soundtrack albums, and has been featured on songs on compilation albums or other artists' respective albums.
Map showing geographical extent of Mississippian stone statues. Mill Creek chert is a type of chert found in Southern Illinois and heavily exploited by members of the Mississippian culture (800 to 1600 CE). [1]
American entertainer Cher has released 27 studio albums, 11 compilation albums, four soundtrack albums, and three live albums.Widely recognized as the "Goddess of Pop", Cher has sold over 100 million records worldwide (as a solo artist) [1] [2] and a further 40 million as part of Sonny & Cher, making her one of the best-selling female recording artists in history.
The Gunflint Iron Formation is a banded iron formation, composed predominantly of dense chert and slate layers interbedded with ankerite carbonate layers. The chert layers can be subdivided into black layers (containing organic material and pyrite), red layers (containing hematite), and green layers (containing siderite). [5]
The chert was discovered by William Mackie while mapping the western margin of the Rhynie basin in 1910–1913. [6] Trenches were cut into the chert at the end of this period, and Robert Kidston and William Henry Lang worked furiously to describe the plant fossils between 1917 and 1921. [6]
Here radiolarian cherts overlie spilites and volcanic rocks. Radiolarites are also found in the nearby Southern Uplands where they are associated with pillow lava. The Scottish radiolarites are followed by deposits in Newfoundland from the Middle and Upper Ordovician. The red Strong Island Chert for instance rests on ophiolites.