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Limestone
Limestone is made from shells of sea creatures, which died millions of years ago. Layers have been built up over
millions of years and squashed together till they formed limestone.
Limestone is always quarried as it such a common rock and appears close to the surface. Most limestone quarries
in Weardale are 19th century, but there are some whose origins are in the Medieval period.
Limestone Kilns were usually built into the side of hills. Inside they were shaped like an inverted cone. Layers
of Limestone then coal would be fed into the top alternatively. The fire would be lit at the bottom. As the flame
rose and heated up the limestone, it would be turned into burnt lime, which was raked out at the bottom and taken
away to be crushed. The level of limestone and coal would decrease within the cone so there would be a man at the
top keeping it filled.
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