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natural history page title
Identifying rocks, minerals and fossils
 Introduction
What is a rock?
What is a 
    mineral?

What is a fossil?
Rock, mineral or 
    fossil?


Rock key
    Sedimentary
   
Igneous
   
Metamorphic
   
Unknown

Mineral key
Fossil key
Helpful books

      

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Sedimentary rock key

Sedimentary rocks are formed from broken fragments of other rocks which are deposited on land or under water. As layers of sediment build up the pressure increases and the sediment becomes solid rock.

Choose the description below that most closely fits your sedimentary rock.
 

thumbnail image of conglomerate linking to the sedimentary rock grainsize key

                                                                    

thumbnail image of coal linking to the sedimentary rock colour key

Rock made up of grains over 0.5mm 


Rock made up of grains smaller than 0.5mm, or has no obvious grains.