WebFordham gneiss, one of the oldest rock formations in the world, can be seen from Inwood Hill Park by looking across Spuyten Duyvil Creek. Named for the Bronx neighborhood where it is most visible, Fordham gneiss was formed around 1.1 billion years ago, in the pre-Cambrian era, during a period of continental shifting. WebFeb 1, 2009 · The cracked light turquoise paint clings to the gneiss on the Bronx side of Spuyten Duyvil Creek, forming the canvas for a stenciled C, a character cloud with a silver lining representing Columbia University. I …

New York City Bedrock GeologyVirtualTrips

Gneiss is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Gneiss forms at higher temperatures and pressures than schist. Gneiss nearly always … See more In traditional English and North American usage, a gneiss is a coarse-grained metamorphic rock showing compositional banding (gneissic banding) but poorly developed schistosity and indistinct cleavage. … See more The word gneiss has been used in English since at least 1757. It is borrowed from the German word Gneiscode: deu promoted to code: de , formerly also spelled Gneisscode: deu … See more • List of rock types • Glossary of geology • Geology portal See more Gneisses are characteristic of areas of regional metamorphism that reaches the middle amphibolite to granulite metamorphic facies. In other words, the rock was metamorphosed at … See more Gneiss has been used as a building material, such as the Facoidal gneiss, used extensively in Rio de Janeiro. Gneiss has also been used as See more • "Gneiss" . Encyclopædia Britannica (11th ed.). 1911. • "Gneiss" . New International Encyclopedia. 1906. See more WebDESCRIPTION: There are three major rock formations that make-up the bedrock of New York City. In stratigraphic order, these are the Fordham Gneiss, Inwood Marble, and … thilo oliver kromer

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WebA protolith is the original, un-metamorphosed rock from which a given metamorphic rock is formed (proto-: first; lithos: rock; both Greek). For example, the protolith of a slate is … Webfor the "schist" facies of the Fordham Gneiss, have a high quartz and feldspar content, generally ± seventy-five percent. In Table 1 the samples labelled "schist" were obtained from a very schistose facies of the Fordham Gneiss. Biotite mica controls the foliation of this rock unit to a high degree as http://yonkersgranite.com/quarry-history-of-ny.html saint margaret mary church winter park fl