| 41. | The floors of the East Frisian Geest were largely made up of sand and boulder clay cover . [ 3]
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| 42. | Boulder clay is classed with a group of poorly sorted materials, described by the non-genetic term diamicton.
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| 43. | The term was formerly given to the boulder clay deposits, supposed to have been caused by the Noachian deluge.
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| 44. | The ice sheet, which stopped around present day Finchley, deposited boulder clay to form Dollis Hill and Hanger Hill.
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| 45. | The solid geology of the area is mainly from the Cretaceous period and consists of Chalk overlain by Quaternary Boulder clay.
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| 46. | Surrounding the town is deposits of boulder clay and glacial sand and gravel can be found to the north-west.
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| 47. | In particular, there are many drift geology is mostly glacial boulder clay, as well as glacial sands and gravel.
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| 48. | The piling went 50 ft ( 15 m ) deep through the boulder clay to the Bunter sandstone ( Buntsandstein ).
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| 49. | The common is underlain with superficial deposits of gravelly boulder clay, which in turn is underlain by Triassic Keuper Sandstone.
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| 50. | It is situated on greensand, whereas the rest of Maulden Wood is situated on a cap of glacial boulder clay.
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