Formation is unclear The exact mode of formation of flint is not yet clear but it is thought that it occurs as a result of chemical changes in compressed sedimentary rock formations, during the process of diagenesis. One hypothesis is that ...
http://uk.answers.yahoo.com/question/index?qid=20080914...
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Although today's flint nodules are inorganic, the silica that formed them was originally sourced from the remains of sea sponges and siliceous planktonic micro-organisms (diatoms, ... Flint is found in areas with chalk bedrock, this is because flint formed within the sediment that later became chalk.
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www.discoveringfossils.co.uk/flint_formation_fossils.ht...
www.discoveringfossils.co.uk/flint_formation_fossils.htm
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Brief and Straightforward Guide: What is Flint? ... Like many rocks, flint is a sedimentary rock, formed over a series of centuries from an assortment of compressed sediments. The mineral can range in color from almost white to black, although it tends to be primarily gray.
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www.wisegeek.com/what-is-flint.htm
www.wisegeek.com/what-is-flint.htm
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Students experience how flint was formed, why people used flint for tools and weapons, how the flint was worked out of the ground, what could be made from this colorful stone, and what sets Flint Ridge flint apart from other flints in America.
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www.ohiohistory.org/places/flint/
www.ohiohistory.org/places/flint/
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Flint is a variety of quartz that commonly occurs in rounded nodules and whose crystal structure is not visible to the naked eye. Flint is dark gray, smoky brown or black in colour; pale gray flint is called chert.
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www.k12.nf.ca/sjis/rocks/igneous/flint.htm
www.k12.nf.ca/sjis/rocks/igneous/flint.htm
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Formation: Flint is found as nodules in limestone formations formed from ancient sea beds. Flint is the result of ancient sea sponges being caught in the fossil bearing sea floor of ancient sea beds.
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www.yourgemologist.com/flint.html
www.yourgemologist.com/flint.html
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However, hardened flint cannot be squashed, so the flint probably formed during the compaction of the surrounding chalk, which is part of the lithification process. A semi-solid accumulation of silica gel had already gathered, but not yet hardened before compaction of the surrounding chalk began.
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www.bbm.me.uk/portsdown/PH_320_Flint.htm
www.bbm.me.uk/portsdown/PH_320_Flint.htm
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Flint - Massive white, cream, gray, brown to black, uniformly colored variety of Chalcedony, usually with some impurities. It is usually found in Limestone or Chalk. Flint fractures into very sharp points and was used by early man for making tools. Arrowheads were formed from Flint.
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www.minerals.net/mineral/silicate/tecto/quartz/varietys...
www.minerals.net/mineral/silicate/tecto/quartz/varietys/flint.htm
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Please go to the new version: ... Harry Rocks, Dorset ; ... Harry Rocks and Ballard Point Chalk - Old-Version Field Guide...
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www.soton.ac.uk/~imw/harry.htm
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