Sedimentary rocks (Clastic or stratified rocks) 

The sedimentary rocks are formed from the erosion and deposition of sediments. The sediments are transported to new places and deposited in new arrangements and cemented to form secondary rocks. Stratification is the most common feature of these rocks and are also termed as stratified rocks. 

They are further classified into two categories:- 

o Clastics (fragmental)

• These are sedimentary rocks which have been formed through physical or  mechanical means.

• Vary in size

• Cementing agents may be Clay, Iron oxide, Silica, or calcium carbonate.

o Precipitates

• These types of sedimentary rocks have been produced by chemical or biochemical precipitation of ions from solution (biochemical precipitates usually involve marine animals and may be fossiliferous).