Term
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Definition
Formed from cemented pieces of older rocks and minerals.
*Weather breaks up rock into sediments
*Transport of Sediments -rivers, glaciers, wind. As they get older they are rounder and smaller.
*Depostion of sediment in layers (like cake)
*Compaction brings the sediment inot a rock. |
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Term
| What is the grainsize of a conglomerate rock? Sandstone? and Clay? |
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Definition
greater than 2mm
sand=.062-2mm
clay/shale=less than .004mm |
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Term
| How do chemical sedimentary rocks form? |
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Definition
Chemical Sedimentary rocks form when minerals precipitate out of water.
(involves creation of new mineral grain) |
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Term
| Inorganic Chemical Sedimentary Rocks. |
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Definition
Evaporates (forms when water evaporates)
EX: Halite, Gypsum. |
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Term
| Biochemical Sedimentary rocks |
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Definition
Rocks that form from skeletons of living organisms.
EX: Fossilferous limestone (skeletons of algae, coral, shellfish. |
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Term
GEOLOGIC LAWS
Law of original Horizontality= Sed. RX form in horizontal layers (flat) |
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Definition
Principle of superposition- Layers of sedimentary rocks are deposited one on top of another.
*Bottom layer= Oldest
*Top layer= youngest. |
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