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Black Shale
Black Shale is much like any
other shale rock.
It is flaky and splits easily into layers.
It is formed under the weight of overlaying sediments.
Unlike slate - a rock formed in similar conditions, it has fossils.
By James St. John via Flickr.com
Unlike the rest of the shale, black shale is carbon rich, because it contains organic remains of sea creatures that did not oxidize but turned into kerogen when the rock formed.
By James St. John via Flickr.com
It would have been due to decreased circulation, either in stagnant basins or slowed deep ocean currents at times of global warming.
Blac shale has some excellent fossils, with even soft tissues fossilised.
The kerogen richest black shales yield oil if heated.
They are also called oil shales.
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