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Details Title: Env. Geo. Description: Sedimentary Rocks Total Flash Cards: 6 Created: 02/26/2006 09:39:16	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term Clastic rocks (detrital) 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. Term What is the grainsize of a conglomerate rock? Sandstone? and Clay? Definition greater than 2mm sand=.062-2mm clay/shale=less than .004mm Term How do chemical sedimentary rocks form? Definition Chemical Sedimentary rocks form when minerals precipitate out of water. (involves creation of new mineral grain) Term Inorganic Chemical Sedimentary Rocks. Definition Evaporates (forms when water evaporates) EX: Halite, Gypsum. Term Biochemical Sedimentary rocks Definition Rocks that form from skeletons of living organisms. EX: Fossilferous limestone (skeletons of algae, coral, shellfish. Term GEOLOGIC LAWS Law of original Horizontality= Sed. RX form in horizontal layers (flat) Definition Principle of superposition- Layers of sedimentary rocks are deposited one on top of another. *Bottom layer= Oldest *Top layer= youngest.