Origin
Jet is a product of high pressure decomposition of wood from millions of years ago, commonly the wood of trees of the family Araucariaceae. Jet is found in two forms, hard and soft. Hard jet is the result of the carbon compression and salt water; soft jet is the result of the carbon compression and fresh water.
The jet found at Whitby, England is of early Jurassic (Toarcian) age, approximately 182 million years old.
Read more about this topic: Jet (lignite)
Famous quotes containing the word origin:
“Someone had literally run to earth
In an old cellar hole in a byroad
The origin of all the family there.
Thence they were sprung, so numerous a tribe
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Of here and there a tent in grove and orchard.”
—Robert Frost (1874–1963)
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—Ralph Waldo Emerson (1803–1882)
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—Henry David Thoreau (1817–1862)