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Shale of the Great Valley Formation ... Picture Gallery of Sedimentary Rocks ... Part of the Great Valley Formation, this shale quickly degrades in roadcuts. Shale requires metamorphism to slate before it can gain any strength.
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geology.about.com/od/more_sedrocks/ig/sedrocksgallery/s...
geology.about.com/od/more_sedrocks/ig/sedrocksgallery/shaleberry.htm
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Shale!!!!! (Lou-Ann Young); Mineral Shale - Shale is a fine grained sedimentary rock formed from clay that has been subjected to great pressure. Shale splits easily into thin layers. Most shale occurs in various shades of grey. ... Here are some other rocks and mineral web sites:
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www.k12.nf.ca/sjis/rocks/sedimentary/shale.htm
www.k12.nf.ca/sjis/rocks/sedimentary/shale.htm
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Shale is the common name applied to fine-grained varieties of sedimentary rock formed by the consolidation of beds of clay or mud. Most shales exhibit fine laminations that are parallel to the bedding plane and along which the rock breaks in an irregular, curving fracture.
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www.starsandseas.com/SAS%20Evolution/SAS%20geology/rock...
www.starsandseas.com/SAS%20Evolution/SAS%20geology/rock_shale.htm
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Shale has the apearance of earthy, hard, mud or clay, which is not surprising since shale is a compacted version of these materials. Shales vary in colour but are generally grey to black or brown. Shale is a soft rock and can easily be scratched with a knife.
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www.em.gov.bc.ca/Mining/Geolsurv/Publications/InfoCirc/...
www.em.gov.bc.ca/Mining/Geolsurv/Publications/InfoCirc/IC1987-05/rocks/shale.htm
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Sedimentary rock is rock that has formed from sediment, like sand, mud, small pieces of rocks. ... Shale - is a dark-colored rock that is usually black, deep red, or gray-green. When shale is wet it get very slippery. It has a fine grain and is usually found below sandstone, not on the surface. Shale was formed from fine...
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www.enchantedlearning.com/subjects/dinosaurs/glossary/S...
www.enchantedlearning.com/subjects/dinosaurs/glossary/Sedimentaryrock.shtml
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The limited data available on the mechanism and the efficiency of the processes by which petroleum is expelled in the subsurface from source rocks into adjacent reservoir rocks are mostly qualitative1,2. We present here material balance-type comparisons of sample series extending from the centre portions of two...
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www.nature.com/nature/journal/v311/n5988/abs/311745a0.h...
www.nature.com/nature/journal/v311/n5988/abs/311745a0.html
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Clay is composed of very fine-grained clay minerals, is not layered and has a plastic consistency. Clay deposits in Ohio were formed as ancient soils beneath coal beds (underclays) of Pennsylvanian age or deposited in glacial lakes during the Pleistocene Ice Age. ... Ohio has long been a center of the clay and shale industry.
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www.ohiohistorycentral.org/entry.php?rec=2824
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Over time, the pressure of overlying sediments may squeeze the water out of the mud, and shale forms. Most shales are gray, but they can also be red, green, black, or brown. Most can be split into layers. ... << Back to Sedimentary rocks...
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fossweb.com/modules3-6/EarthMaterials/activities/rockda...
fossweb.com/modules3-6/EarthMaterials/activities/rockdatabase/sedimentary_rocks/shale.html
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Shale is one of the major types of sedimentary rocks. ... Shale is a claystone that is fissile, splitting in layers. Shale is usually soft and does not crop out unless harder rock protects it. (more below) ... Geologists are strict with their rules on sedimentary rocks. Sediment is divided by particle size into gravel, sand,
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geology.about.com/od/rocks/ig/sedrockindex/rocpicshale....
geology.about.com/od/rocks/ig/sedrockindex/rocpicshale.htm
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