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 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.
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.
