Sedimentary rock notes09

Sedimentary rock notes09

• 1.
  Sedimentary Rocks
• 2.
  What are they? 3 types:  Clastic or Terrigenous  Biogenic  Chemical
• 3.
  Clastic or Terrigenous sedimentaryrocks  WEDCC  Many depositional locations:  Continental  Shoreline  Marine
• 4.
  Grain Size Name ofParticle 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- howuniform 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