| 词汇 | boulder-clay |
| 释义 | boulder clay noun[ U ] geology specializeduk /ˈbəʊl.də ˌkleɪ/ us /ˈboʊl.dɚ ˌkleɪ/ a type of heavy, sticky soil full of large rocks that is formed in and between large areas of ice泥砾层;冰砾土 Soil alluvial clay clayey cover crop earthiness frozen humic humus lime loam ooze peat bog sandy sedimentation silt soil solarization solarize unploughed worm cast On this sand a great mass of boulder clay usually quite devoid of fossils was accumulated. The boulder clay, when it was first studied, seemed in many of its characters so singular and anomalous, that geologists despaired of ever being able to interpret the phenomena by reference to causes now in action. The chalk, then, is certainly older than the boulder clay. The difficulty, moreover, of accounting for the entire dearth of marine shells in till is removed when once we have adopted the theory of this boulder clay being the product of land-ice. Examples of boulder clayboulder clay Boulderclay is classed with a group of poorly sorted materials, described by the non-genetic term diamicton. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Boulderclay and clays are also found south of the village. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Boulderclay is also abundant and moraines cover substantial areas. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. So only at the margins of an ice sheet would the fluctuating sedimentary record be preserved, whereas interior glaciation might compound tills in final deposits of boulderclay. We will not, for example, have the fritillary without water meadows, nor the oxlip without ancient boulderclay woods. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 It is sour, limeless, boulderclay, with not very good drainage, and an unfortunate predilection for growing rushes. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 They told me that they had run into 12 kilometres of boulderclay and that it was improbable that they would be able to bury the pipeline for that length. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 The valley bottoms have a thin deposit of boulderclay. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The local drift geology is mostly glacial boulderclay, as well as glacial sands and gravel. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The clay-rich hilltop soils are primarily a consequence of blanketing of the area with boulderclay or glacial till during the recent glaciations. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Till, also known as boulderclay, is a mix of unconsolidated sediment with a range of grain sizes (clay-boulder). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Much boulderclay is of a bluish-grey until exposed to weather which causes a transformation to a brown colour. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Beneath the pasture the archaeology is on boulderclay overlying magnesian limestone. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The earliest masonry building was the church, which was constructed on shallow foundations of sandstone rubble and pebbles on boulderclay. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It consists of ancient semi-natural woodland on a boulderclay soil. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. See all examples of boulder clay These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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