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Sedimentary rock notes09

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  • 1. Sedimentary Rocks
  • 2. What are they?  3 types:  Clastic or Terrigenous  Biogenic  Chemical
  • 3. Clastic or Terrigenous sedimentary rocks  WEDCC  Many depositional locations:  Continental  Shoreline  Marine
  • 4. Grain Size Name of Particle Size Range Loose Sediment Consolidated Rock Boulder >256 mm Gravel Conglomerate or Breccia (depends on rounding) Cobble 64 - 256 mm Gravel Pebble 2 - 64 mm Gravel Sand 1/16 - 2mm Sand Sandstone Silt 1/256 - 1/16 mm Silt Siltstone Clay <1/256 mm Clay Claystone, mudstone, and shale
  • 5. Texture  Sorting- how uniform the particle size is  Rounding- angular to rounded
  • 6. Sedimentary structures  Bedding (stratification)  Cross-bedding  Ripples  Fossils
  • 7. Biogenic sedimentary rocks  Usually carbonate sediments  Classified by mineral composition  Created through biological processes  Limited depositional location
  • 8. Chemical sedimentary rocks  precipitation of salts from solution  Marine or non-marine  Gypsum  Halite