| Associated units are sillimanite-bearing aluminous metasediments, quartzites, and arnphibolites. |
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| The major rock types in the Masasi area are granitoid gneisses, marbles, schists and quartzites. |
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| A variety of sedimentary lithologies have been metamorphosed including pelites, psammites, quartzites and carbonates. |
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| Here it again flows through narrow, steep-edged trenches formed by quartzites and shales. |
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| The rocks from which the zircons in the quartzites and conglomerates were derived have either disappeared or have not yet been found. |
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| The copper is associated with silver, cobalt, lead and zinc in quartzites and dolomites. |
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| The lower portion of the river, east of Irving Lake, flows over somewhat more easily eroded rocks including quartzites and slates. |
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| These rocks crop out very close to the quartzites but again, it was not possible top put a finger on the contact without excavation. |
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| Climbing the gorgeous quartzites of the main continental divide ranges is a one-of-a-kind experience. |
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| The materials that predominate are slates, schists and sandstones from the Paleozoic, combined with strips of quartzites and grey limestones. |
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| On Serpentine River, medium-bedded quartzites of the Chain of Rocks Formation are exposed below the unconformity. |
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| Pure quartzites are a source of silica for metallurgical purposes and for the manufacture of silica brick. |
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| The eye of bull belongs to the family of quartzites and is composed of dioxide of silicon. |
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| In this point, it is possible to observe the evolution of the Limestones of Ubaga, starting from a basic conglomeratic facies overlapped to the quartzites of M. Bignone. |
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| In the Seaside Adjunct the mixture of the granites and quartzites is clearly shown in exposed rock outcrops while the till layer is extremely thin and poorly drained. |
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| In several locations the quartzites below the glacial horizon have been rucked into a series of folds. |
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| The pits intersected the Chimu formation and bottomed in strongly altered diorite intruding the overlying quartzites. |
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| Levallois cores are on fine-to-medium-grained quartzites, some being unstruck. |
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| Slightly auriferous conglomerates, quartzites and other rocks. |
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| The landscape is characterized by the reliefs formed by quartzites. |
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| Most quartzites contain 90 percent or more quartz, but some contain 99 percent and are the largest and purest concentrations of silica in the Earth's crust. |
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| In the southwest, Precambrian quartzites were formed from very ancient sea sediments and form strikingly sharp ridges and ranges, such as Federation Peak or Frenchmans Cap. |
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| This is in an area covered by Thelon sandstones near the flank of a north-south trending basement horst of Paleoproterozoic Hurwitz Group quartzites. |
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| Quartzites and anthophyllite schists are also present in this zone, although they do not appear on the map because of the scale. |
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