SEDIMENTARY  STRUCTURES

 

Sedimentary structures are features in sedimentary rocks that provide information about the physical environment conditions present when sediments were originally deposited.  They permit geologists to determined whether, for example, a particular sandstone was deposited in an ancient desert environment, a river environment, a beach environment, a shallow ocean environment, or wherever.

 

Some sedimentary structures are not very informative.  Others provide exceedingly specific information about the original depositional environment.

 


 

  CROSS  BEDDING

 

  SYMMETRICAL  RIPPLES

 

  INTERFERENCE  RIPPLES

 

  MUDCRACKS

 

  FLUTE  CASTS

 

  RAINDROP  IMPRINTS

  

  GYPSUM  CASTS

 

  HALITE  SALT  CASTS

 


 

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