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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
     Rock colour 
         key

     Pale rock key
     Limestone
     Chalk
     Unknown 
        pale rock

     Dark rock key
     Clay
     Ironstone
     Coal
     Unknown 
        dark rock

    
    Igneous
    Metamorphic
    Unknown
Mineral key
Fossil key
Helpful books

  
Ironstone
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image of a blackband ironstone core sample

Your sedimentary rock is probably ironstone. Ironstone is made up of clay minerals and a heavy iron carbonate called siderite, and was produced by water flowing through already deposited sediment.
Ironstone is commonly found in nodules in the Carboniferous coal measure rocks (about 300 million years old) of The Potteries area which occasionally contain fossils.