| 11. | The underlying rocks are a Carboniferous Limestone along with some Millstone Grit to the east.
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| 12. | The geology of Oldham is represented by the Millstone Grit and Coal Measures series of rocks.
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| 13. | It is constructed of sandstone with Millstone Grit dressings and is built directly on the bedrock.
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| 14. | The Millstone Grit outcrops at the Cow and Calf Rocks near Ilkley form a rolling dissected plateau.
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| 15. | These were followed by dark marine shales, siltstones, and coarse sandstones of the Millstone Grit.
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| 16. | A major problem was the change in the rock type which ranged from soft earth to Millstone Grit.
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| 17. | The Millstone Grit Group comprises the Pendleton, Silsden, Samlesbury, Hebden, Marsden and Rossendale formations.
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| 18. | This suggests that early pastoral farming on millstone grit soil flourished in areas where lime was most easily available.
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| 19. | Many of the Millstone Grit boulders at the site are perched on pedestals of limestone up to 30cm high.
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| 20. | Parts of these sites were formerly quarried or gleaned for millstone grit but have now reverted to woodland and scrub.
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