geology 101 notes chapter 6
geology 101 notes chapter 6 GEO101
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This 2 page Class Notes was uploaded by taylor neal on Monday February 9, 2015. The Class Notes belongs to GEO101 at Washington State University taught by kurt wilkie in Fall. Since its upload, it has received 43 views. For similar materials see Geology 101 in Geology at Washington State University.
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Date Created: 02/09/15
October 1 2014 Chapter 6 Pages of the Past Sedimentary Rocks Abundance by Sedimentary rock types 0 Siltstone mudstone amp shale 75 o Sandstone amp conglomerate 11 o Carbonate rocks 14 ClasticDetrital Sedimentary Rock 0 Composed pieces of preexisting rocks clastic sediment o Classified by texture size shape amp arrangement of sediments Mudstone Sandstone Conglomerate or breccia 0 Texture affected by transport process terms may be used to describe sediment or sedimentary rocks Particle size clay silt sand granule pebble cobble amp boulder Shape o Angular to well rounded o Smoothing of fragment edges Sorting similarity in size 0 Well sorted to poorly sorted o If same size well sorted If different sizes poorly sorted The more angular the less transport The more rounded the greater the transport With more transport the particles become smaller amp better sorted similar in size Biochemical Sedimentary Rocks 0 Comprised of the remains of organisms plants amp animals 0 Classified by composition ex limestone 0 Shallow marine reef or if vegetation swamp Chemical Sedimentary Rocks 0 Composed of mineral precipitated out of solution like salt evaporating seawater 0000 Looks crystalline but crystals may be very small Classified by composition minerals Ex rock salt rock gypsum Evaporate associated with ocean or continent Sedimentary structures 0 Bedding stratifications Parallel layers of sediments Each layer is called a bed October 1 2014 Crossbedding I Sets of bedded sediments at an anlge to horizontal I Deposited by currents wind or water I Ex sand dunes I Crossbedding indicates the direction of current Graded bedding I Beds progress from coarse grains at bottom to fine grains at top of bed I Indicates waning of current Ripple marks I Wavy lines formed on top of bed of sand or silt by water or currents I Similar scale than larger cross bed I Can be preserved in rocks I Common on shorelines I Ripples can be symmetrical or asymmetrical Mudcracks I Polygonal pattern of cracks that develop in mud
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