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| concretion |
a solid mass made by or as if by coalescence, such as a mass of calcium or other inorganic material found in living tissue, or a mineral mass found in sedimentary rock. [1/3 definitions] |
| dolomite |
a sedimentary rock, similar to limestone, that consists mainly of this mineral. Also known as dolostone. [1/2 definitions] |
| kerogen |
a substance found in certain sedimentary rocks, esp. shale, from which shale oil can be produced. |
| laccolith |
a mass of igneous rock that has been forced between layers of sedimentary rock and has bulged them upward. |
| limestone |
a sedimentary rock of calcium carbonate formed mostly from animal remains such as shells and used in building and in manufacturing cement, lime, and carbon dioxide. |
| phosphate rock |
sedimentary rocks that contain large amounts of calcium phosphate, used in making fertilizer, phosphorous chemicals, and the like. |
| ripple mark |
one of these ridges preserved in sedimentary rock. [1/2 definitions] |
| shale |
a sedimentary rock made up of layers of fine clay-like sediments that can easily be split into thin sheets. |
| taconite |
a fine-grained sedimentary rock with enough iron content to be used as low-grade iron ore. |
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