0 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
Boulder clay is classed with a group of poorly sorted materials, described by the non-genetic term diamicton.
Boulder clay and clays are also found south of the village.
Boulder clay is also abundant and moraines cover substantial areas.
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 boulder clay.
We will not, for example, have the fritillary without water meadows, nor the oxlip without ancient boulder clay woods.
It is sour, limeless, boulder clay, with not very good drainage, and an unfortunate predilection for growing rushes.
They told me that they had run into 12 kilometres of boulder clay and that it was improbable that they would be able to bury the pipeline for that length.
The valley bottoms have a thin deposit of boulder clay.
