| 21. | The landscape is dominated by deposits of till, boulder clays and glacial lake clays.
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| 22. | The dam was constructed with the boulder clay and alluvium excavated from the reservoir bed.
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| 23. | The underlying rocks are the coal measures of the Manchester Coalfield covered with boulder clay.
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| 24. | He found a five-metre thickness of boulder clay overlaid by sand and gravel.
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| 25. | The Holderness landscape is dominated by deposits of till, boulder clays and glacial lake clays.
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| 26. | Glacial drumlins of boulder clay lie in the vales of the Dee, Cree and Urr.
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| 27. | Subsequently, during the same or a later Britain by the older name of boulder clay.
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| 28. | When the glacier finally retreated they left deep deposits of boulder clay and glacial alluvium behind.
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| 29. | :: : We are on real Suffolk clay ( chalky boulder clay to geologists ).
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| 30. | When the ice finally retreated it left deep deposits of boulder clay ( or till ) behind.
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