Sedimentary rock notes09
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Transcript of Sedimentary rock notes09
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Sedimentary Rocks
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What are they?
3 types: Clastic or Terrigenous Biogenic Chemical
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Clastic or Terrigenous sedimentary rocks WEDCC
Many depositional locations: Continental Shoreline Marine
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Grain SizeName 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
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Texture Sorting- how uniform
the particle size is
Rounding- angular to rounded
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Sedimentary structures
Bedding (stratification) Cross-bedding Ripples Fossils
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Biogenic sedimentary rocks
Usually carbonate sediments
Classified by mineral composition
Created through biological processes
Limited depositional location
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Chemical sedimentary rocks
precipitation of salts from solution Marine or non-marine Gypsum Halite