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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
        Grain size 
            key
       Conglomerate
       Sandstone
       Unknown

    Igneous
    Metamorphic
    Unknown

Mineral key
Fossil key
 Helpful books
     

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Sedimentary rock key - grain size

Choose the description below that most closely describes the size of the grains in your sedimentary rock.
 

thumbnail image of conglomerate leading to further information

thumbnail image of fossiliferous sandstone linking to further information

thumbnail image of silty sandstone linking to general information about granular sedimentary rocks
Grains over 5mm, obvious fragments of other rocks within the specimen Grains between 0.5 - 5mm, grains look like sand

My sedimentary rock doesn't fit either of those descriptions!